Environmental Remediation Obligations [Abstract] Environmental Remediation Obligations [Abstract] Supplemental information: Supplemental Cash Flow Information [Abstract] Unrealized (Loss) Gain on Available-For-Sale Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Trademarks and trade names Trademarks and Trade Names [Member] Net income Net income Net income Net income Net Income (Loss) Attributable to Parent Remedial liabilities, less current portion of $18,585 and $13,121, respectively Accrued Environmental Loss Contingencies, Noncurrent Entity Emerging Growth Company Entity Emerging Growth Company Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accrued compensation and benefits Employee-related Liabilities, Current Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Entity Address, Address Line One Entity Address, Address Line One Other intangible assets Other Intangible Assets [Member] Remedial liability assumed in acquisition of property, plant and equipment Remedial Liability Assumed In Acquisition Of Property, Plant And Equipment Remedial Liability Assumed In Acquisition Of Property, Plant And Equipment Proceeds from sale and disposal of fixed assets Proceeds from Sale of Property, Plant, and Equipment Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Cash payments for interest and income taxes: Cash Payments for Interest and Income Taxes [Abstract] Description and amounts of long lived assets and liabilities held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets and liabilities held for sale, the gain or loss recognized in the income statement and the income statement caption that includes that gain or loss. Site Contingency [Table] Site Contingency [Table] Schedule of Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Unfunded pension liability Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Additional paid-in capital Additional Paid in Capital, Common Stock Entity Filer Category Entity Filer Category Other Other Assets, Noncurrent Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Segments [Axis] Segments [Axis] Decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Measurement Period Adjustments, Goodwill Measurement period adjustments from prior period acquisitions Goodwill, Purchase Accounting Adjustments Schedule of Reclassification Out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Measurement Period Adjustments, Total identifiable net assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Acquired and Liabilities Assumed, Net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Acquired and Liabilities Assumed, Net Reconciliation to Consolidated Statements of Income to Adjusted EBITDA Schedule Of Reconciliation Of Net Income To Adjusted Earnings Before Interest Tax Depreciation And Amortization Consolidated [Table Text Block] Schedule Of Reconciliation Of Net Income To Adjusted Earnings Before Interest Tax Depreciation And Amortization Consolidated Deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization of permits and other intangible assets Amortization of Intangible Assets Derivative Fixed Interest Rate Period [Domain] Derivative Fixed Interest Rate Period [Domain] Derivative Fixed Interest Rate Period [Domain] Other intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Deferred financing costs paid Payments of Financing Costs Secured senior term loans due October 8, 2028 ("2028 Term Loans") 2028 Term Loans [Member] 2028 Term Loans Antidilutive shares excluded from computation of earning per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Inventories and Supplies Schedule of Inventory, Current [Table Text Block] Business Combination and Asset Acquisition [Abstract] Fair value of share-based payment awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Business Acquisition [Axis] Business Acquisition [Axis] Property, plant and equipment, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Unrealized loss on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Number of sites owned by the entity subject to proceedings under federal or state superfund laws Site Contingency, Number of Sites Owned by Entity The number of sites that are subject to proceedings under federal or state superfund laws that are owned by the entity. Summary of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Award Type [Domain] Award Type [Domain] Number of sites owned by third parties Site Contingency, Number of Sites Owned by Third Party The number of sites owned by third parties subject to proceedings under federal or state Superfund laws for which the company or the prior owners shipped wastes. Derivative Fixed Interest Rate Period One Derivative Fixed Interest Rate Period One [Member] Derivative Fixed Interest Rate Period One Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] Land Land [Member] ROU assets obtained in exchange for finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Accumulated Earnings Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Accretion Asset Retirement Obligation, Accretion Expense COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Repurchases of common stock Stock Repurchased and Retired During Period, Value Inventory, Current [Table] Inventory, Current [Table] Secured debt Secured Debt [Member] Accounts receivable and unbilled accounts receivable Increase (Decrease) in Accounts Receivable Schedule of Changes to Remedial Liabilities Schedule of Environmental Loss Contingencies by Site [Table Text Block] Purchase price adjustment received Measurement Period Adjustments, Total purchase price Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Property, plant and equipment accrued Capital Expenditures Incurred but Not yet Paid Inventories and supplies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory ROU assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Weighted average interest rate Debt, Weighted Average Interest Rate BR Facility BR Facility [Member] BR Facility Number of sites for which environmental remediation expense is settled Site Contingency, Environmental Remediation Expense Settled Number of Sites Owned by Third Party The number of sites owned by the third party for which environmental remediation expense is settled. Contingency Nature [Domain] Contingency Nature [Domain] An existing condition, situation, or a set of circumstances, which involve uncertainty as to the possible outcomes to an enterprise that will ultimately be resolved, when one or more future events occur or fail to occur. Resolution of the uncertainty may confirm the incurrence of a loss or profit or the incurrence of a liability. Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Changes in estimates recorded to consolidated statement of operations Asset Retirement Obligation, Changes Recorded in Statement of Income The amount of change in the asset retirement obligation, during the current period, for changes in estimates recorded in the statement of income. Industrial Services and Other Industrial Services And Other [Member] Industrial Services And Other [Member] Payments on finance leases Finance Lease, Principal Payments Closure and post-closure liabilities, current portion Accrued Capping, Closure, Post-closure and Environmental Costs Entity Interactive Data Current Entity Interactive Data Current Total other assets Assets, Noncurrent, Excluding Property, Plant and Equipment Sum of the carrying amounts as of the balance sheet date of all assets (excluding property, plant and equipment) that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. Number of operating segments Number of Operating Segments Available to borrow and outstanding letters of credit Line of Credit Facility, Remaining Borrowing Capacity Derivative, fixed interest rate Derivative, Fixed Interest Rate Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic Number of proceedings as defendant Loss Contingency, Pending Claims, Number Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] REVENUES Revenue from Contract with Customer [Text Block] Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Document Type Document Type Canada CANADA Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Current Reporting Status Entity Current Reporting Status Other (income) expense, net Other Noncash Income (Expense) Remedial liabilities Site Contingency [Line Items] Operating lease right-of-use assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Right-of-Use Asset Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Right-of-Use Asset Permits Permits [Member] The description that pertains to the permits. Purchase price to acquire business Business Combination, Consideration Transferred Allowance for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Long-term debt, at par Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Field and Emergency Response Services Field and Emergency Response [Member] Field and Emergency Response [Member] HydroChemPSC HydroChemPSC [Member] HydroChemPSC Debt outstanding Long-term Debt Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec Number of Neighboring Municipalities Filing Separate Legal Proceedings This element represents the number of municipalities other than Ville Mercier that filed legal proceedings against the Mercier Subsidiary. Accrued insurance Accrued Insurance, Current Cash flows used in investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Goodwill impairment Goodwill, Impairment Loss Document Transition Report Document Transition Report Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Closure and post-closure liabilities, less current portion of $7,808 and $12,015, respectively Accrued Capping, Closure, Post-closure and Environmental Costs, Noncurrent Total liabilities and stockholders’ equity Liabilities and Equity Accrued other Other Accrued Liabilities, Current Deferred revenue Contract liabilities (deferred revenue) Contract with Customer, Liability, Current Service revenues Service [Member] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Safety-Kleen Environmental Services Safetly-Kleen Environmental Services [Member] Safetly-Kleen Environmental Services [Member] Accounts payable Increase (Decrease) in Accounts Payable Interest Rate Swap Interest Rate Swap [Member] Interest expense, net of interest income Interest Expense, Net Interest Expense, Net EARNINGS PER SHARE Earnings Per Share [Text Block] Interest rate swap liability Derivative Liability, Current 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Short-term marketable securities Marketable Securities, Current Line of credit outstanding balances Long-term Line of Credit Measurement Period Adjustments, Current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities Effect of exchange rate change on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Selling, general and administrative expenses Selling, General and Administrative Expense Closure and Post-closure Liabilities [Axis] Closure and Post-closure Liabilities [Axis] The information about each closure and post-closure liabilities during the period. Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Unrecognized tax benefits Unrecognized Tax Benefits Solvent and solutions Solvent And Solutions [Member] Solvent And Solutions Legal and Administrative Proceedings Legal and Administrative Proceedings [Member] Represents the actual or potential liabilities that are related to the legal and administrative proceedings. New asset retirement obligations Asset Retirement Obligation, Liabilities Incurred Other assets: Other Assets, Noncurrent [Abstract] Trading Symbol Trading Symbol Number of product liability claims settled or dismissed Loss Contingency, Claims Settled and Dismissed, Number Contingencies by Nature of Contingency [Axis] Contingencies by Nature of Contingency [Axis] Quantifies and describes each contingency that exists as of the balance sheet date, by nature of the probable or possible estimates. Amounts reclassified out of accumulated other comprehensive loss Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] FINANCING ARRANGEMENTS Debt Disclosure [Text Block] Line of Credit Line of Credit [Member] Reconciliation to Consolidated Statements of Operations: Reconciliation of Net Income to Adjusted EBITDA [Abstract] Reconciliation of Net Income to Adjusted EBITDA STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] INVENTORIES AND SUPPLIES Inventory Disclosure [Text Block] Measurement Period Adjustments, Prepaid expenses and other current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Expenses And Other Current Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Expenses And Other Current Assets Less - accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Accounting Policies [Abstract] Accounting Policies [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Liability assumed in acquisition of real estate Accrual for Environmental Loss Contingencies, Increase (Decrease) for Acquisitions and Divestitures Cost of revenues: (exclusive of items shown separately below) Cost of Revenue [Abstract] Other non-current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Outstanding letters of credit Letters of Credit Outstanding, Amount Number of sites with indemnifying parties paying all costs Site Contingency, Number Of Sites With Indemnifying Parties Paying All costs Site Contingency, Number Of Sites With Indemnifying Parties Paying All costs Common stock Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Period for recognition (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Beginning of period (in dollars per share) End of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Current portion of closure, post-closure and remedial liabilities Accrued Capping, Closure, Post Closure and Remedial Liabilities, Current The amount of estimated costs accrued as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility (such as a landfill or waste treatment facility) and to remediate one or more sites. Represents the portion that will be paid within one year. Commitments and contingent liabilities (See Note 16) Commitments and Contingencies Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Account receivable, allowances aggregating Accounts Receivable, Allowance for Credit Loss, Current BUSINESS COMBINATIONS Business Combination Disclosure [Text Block] Restricted stock awards Restricted Stock [Member] Minimum potential liability Loss Contingency, Range Of Possible Loss, Minimum Loss Contingency, Range Of Possible Loss, Minimum Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Document Period End Date Document Period End Date Current portion of operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating Lease Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating Lease Dilutive effect of outstanding stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Secured senior term loans due June 30, 2024 ("2024 Term Loans") 2024 Term Loans [Member] 2024 Term Loans Goodwill [Line Items] Goodwill [Line Items] Number of sites, potential liability exceeds substantial quota Number Of Sites, Potential Liability Exceeds Substantial Quota Number Of Sites, Potential Liability Exceeds Substantial Quota Pro forma combined net income Business Acquisition, Pro Forma Net Income (Loss) Entity Registrant Name Entity Registrant Name Interest expense, net of interest income Interest Income (Expense), Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Measurement Period Adjustments, Current portion of operating lease liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Liabilities, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Liabilities, Current Accrued expenses and other current liabilities Total accrued expenses Accrued Liabilities, Current Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Changes in estimates recorded to consolidated statement of operations Accrual for Environmental Loss Contingencies, Revision in Estimates Equity [Abstract] Equity [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Common Stock Common Stock [Member] Interest income Investment Income, Interest SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Income from operations Income from operations Operating Income (Loss) Measurement Period Adjustments, Other non-current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Current portion of operating lease liabilities Operating Lease, Liability, Current Schedule of Closure and Post-Closure Liabilities Schedule of Change in Asset Retirement Obligation [Table Text Block] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Currency translation and other Accrual for Environmental Loss Contingencies, Increase (Decrease) for Currency Translation and Other The increase or decrease in the accrual for environmental loss contingencies, during the reporting period that is related to currency translations and other adjustments. Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Stock-based compensation Stock-based compensation Share-based Payment Arrangement, Noncash Expense AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Inventory [Axis] Inventory [Axis] Additional Paid-in Capital Additional Paid-in Capital [Member] Tax benefit (provision) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Closure and Post-closure Liabilities [Domain] Closure and Post-closure Liabilities [Domain] Closure and Post-closure Liabilities [Domain] Purchases of available-for-sale securities Payments to Acquire Debt Securities, Available-for-sale Performance stock awards Performance Stock Awards [Member] Performance Stock Awards [Member] Notional amount of interest rate swap agreements Derivative, Notional Amount Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Other income (expense), net Other (income) expense, net Other Nonoperating Income (Expense) Debt fair value Long-term Debt, Fair Value Other current and long-term liabilities Increase (Decrease) in Other Operating Liabilities Repurchases of common stock (in shares) Stock Repurchased and Retired During Period, Shares Increase of remedial liabilities Accrual for Environmental Loss Contingencies, Period Increase (Decrease) Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Change in uncashed checks Increase (Decrease) in Outstanding Checks, Financing Activities Changes to post-closure liabilities Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Business Combinations [Abstract] Business Combinations [Abstract] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Measurement Period Adjustments, Accounts receivable, including unbilled receivables Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Changes in estimates recorded to consolidated balance sheet Asset Retirement Obligation Changes Recorded in Balance Sheet Asset Retirement Obligation Changes Recorded in Balance Sheet Schedule of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Award Type [Axis] Award Type [Axis] 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Cash flows used in financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] Total stockholders’ equity Balance beginning of period Balance ending of period Stockholders' Equity Attributable to Parent Asset retirement costs (non-landfill) Asset Retirement Obligation Costs [Member] Common stock, issued shares (in shares) Common Stock, Shares, Issued Environmental expenditures Payments for Environmental Liabilities Prepaid expenses and other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] March 27, 2021 Acquisition March 27, 2021 Acquisition [Member] March 27, 2021 Acquisition Repurchases of common stock Payments for Repurchase of Common Stock Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Operating lease liabilities, less current portion Operating Lease, Liability, Noncurrent Remedial Liabilities for Landfill Sites Remedial Liabilities for Landfill Sites [Member] This element represents the details that pertain to the remedial liability for landfill sites. Debt Instrument, face amount Debt Instrument, Face Amount Effective interest rate percentage Debt Instrument, Interest Rate, Effective Percentage Deferred contract cost, recognition period Deferred Contract Cost, Recognition Period Deferred Contract Cost, Recognition Period Derivative Fixed Interest Rate Period Two Derivative Fixed Interest Rate Period Two [Member] Derivative Fixed Interest Rate Period Two Total purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Income tax benefit Share-based Payment Arrangement, Expense, Tax Benefit City Area Code City Area Code Accumulated earnings Retained Earnings (Accumulated Deficit) Operating segments Operating Segments Operating Segments [Member] Balance at January 1, 2022 Balance at March 31, 2022 Asset Retirement Obligation Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Allocation of Purchase Price Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Reconciliation of Third Party Revenues to Direct Revenues Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Remedial Liabilities for Inactive Sites Remedial Liabilities for Inactive Sites [Member] This element represents the details that pertain to the remedial liabilities for inactive sites. Business Acquisition [Line Items] Business Acquisition [Line Items] Closure and Post-closure Liabilities [Table] Closure and Post-closure Liabilities [Table] The schedule that reflects each closure and post-closure liabilities, during the period. Income Statement [Abstract] Income Statement [Abstract] Amendment Flag Amendment Flag CLOSURE AND POST-CLOSURE LIABILITIES Asset Retirement Obligation Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Accounts receivable, including unbilled receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Trademarks and trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Provision for income taxes Income Tax Expense (Benefit) Accounts receivable, net of allowances aggregating $45,373 and $40,140, respectively Receivables Accounts Receivable, after Allowance for Credit Loss, Current Unsecured debt Unsecured Debt [Member] Safety-Kleen Oil Safety-Kleen Oil [Member] Safety-Kleen Oil [Member] Derivative Fixed Interest Rate Period [Axis] Derivative Fixed Interest Rate Period [Axis] Derivative Fixed Interest Rate Period Equity Components [Axis] Equity Components [Axis] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total current assets Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Inventories and supplies Inventory, Net Ville Mercier Ville Mercier [Member] Represents the details that pertain to the Ville Mercier. Reclassification adjustment for losses on interest rate hedge included in net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Entity File Number Entity File Number Secured senior term loans Term Loan Agreement [Member] Term Loan Agreement [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Remedial liabilities, current portion Accrued Environmental Loss Contingencies, Current Current portion of long-term debt Long-term Debt, Current Maturities Product and Service [Axis] Product and Service [Axis] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Technical Services Technical Services [Member] This element represents the Technical Services segment of the entity. Entity Small Business Entity Small Business Landfill assets Landfill [Member] Equity Component [Domain] Equity Component [Domain] Accretion of environmental liabilities Accretion of environmental liabilities Accretion of environmental liabilities Accretion of Environmental Liabilities This element includes accretion expenditure that pertains to asset retirement obligations and environmental remediation. Vehicles Vehicles [Member] Statement [Line Items] Statement [Line Items] Unrealized gain on interest rate hedge Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Property, plant and equipment, net Total property, plant and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Stock-based compensation Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Landfill Retirement Liability Landfill Retirement Liability [Member] Represents the asset retirement obligations for landfill liability. Issuance of common stock for restricted share vesting, net of employee tax withholdings Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Total permits and other intangible assets, Cost Intangible Assets, Gross (Excluding Goodwill) Debt Disclosure [Abstract] Debt Disclosure [Abstract] Entity Address, State or Province Entity Address, State or Province Operating and Corporate non-segment Operating Segments And Corporate Non Segment [Member] Operating Segments And Corporate Non Segment [Member] Income before provision for income taxes Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Corporate Corporate, Non-Segment [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Schedule of Reconciliation of Basic and Diluted Earnings per Share Computations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Entity Shell Company Entity Shell Company Measurement Period Adjustments, Operating lease liabilities, less current portion Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Liabilities, Noncurrent Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Liabilities, Noncurrent Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Interest on unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Accrued Local Phone Number Local Phone Number Other comprehensive income, net of tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Interest rate swap, asset Interest Rate Cash Flow Hedge Asset at Fair Value Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Total assets Assets Common stock, authorized shares (in shares) Common Stock, Shares Authorized Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Net income Net Income (Loss) Available to Common Stockholders, Diluted Geographical [Domain] Geographical [Domain] Net income Net Income (Loss) Available to Common Stockholders, Basic Supplies Supplies [Member] ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Product and Service [Domain] Product and Service [Domain] Number of permits issued by government, for dumping organic liquid Number of Permits Issued by Government to Dump Organic Liquid The number of permits that are granted by the government in relation to environmental liabilities. Interest rate (as a percentage) Debt Instrument, Interest Rate, Stated Percentage Credit-adjusted risk-free rate Asset Retirement Obligations Discount Rate Asset Retirement Obligations Discount Rate Derivative Contract [Domain] Derivative Contract [Domain] Third party sites requiring expenditure on remediation Site Contingency, Environmental Remediation Expense Number of Sites Owned by Third Party The number of sites for which environmental remediation expense is incurred subject to proceedings under federal or state superfund laws owned by third party. Indemnification agreement, number of sites acquired Site Contingency, Indemnification Agreement Number Of Sites Acquired Site Contingency, Indemnification Agreement Number Of Sites Acquired Measurement period adjustment from a prior period acquisition Accrual for Environmental Loss Contingencies, Measurement Period Adjustment From a Prior Period Acquisition Accrual for Environmental Loss Contingencies, Measurement Period Adjustment From a Prior Period Acquisition Total other liabilities Liabilities, Noncurrent Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Revolving Credit Facility Revolving Credit Facility [Member] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Net cash (used in) from operating activities Net Cash Provided by (Used in) Operating Activities Furniture and fixtures Furniture and Fixtures [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity Tax Identification Number Entity Tax Identification Number Geographical [Axis] Geographical [Axis] Shares used to compute earnings per share - Basic (in shares) Weighted-average basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Non-Landfill Retirement Liability Non-Landfill Retirement Liability [Member] Represents the asset retirement obligations for non-landfill liability. Amortization of deferred financing costs and debt discount Amortization of Debt Issuance Costs and Discounts Product revenues Product [Member] Income taxes paid, net of refunds Income Taxes Paid, Net Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Permits and other intangibles, net Total permits and other intangible assets, Net Intangible Assets, Net (Excluding Goodwill) General damages sought Loss Contingency, General Damages Sought, Value Loss Contingency, General Damages Sought, Value Goodwill, deductible for tax purposes Business Acquisition, Goodwill, Expected Tax Deductible Amount Other Other Inventories [Member] Other Inventories Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Deferred tax liabilities Deferred Income Tax Liabilities, Net Number of sites owned by third party excluded from cleanup or related liabilities Site Contingency, Number of Sites The number of sites that are subject to proceedings under federal or state superfund laws brought against the company or against third parties for which the company may have certain indemnification obligations. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Indemnification agreement with third party sites Site Contingency, Indemnification Agreement Number of Sites Owned by Third Party The number of sites for which the company has an indemnification agreement from the third party seller. REMEDIAL LIABILITIES Environmental Loss Contingency Disclosure [Text Block] Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Schedule of Restricted Stock Awards Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Depreciation expense, inclusive of landfill and finance lease amortization Depreciation Expense, Inclusive Of Landfill And Finance Lease Amortization Depreciation Expense, Inclusive Of Landfill And Finance Lease Amortization Accounts payable Accounts Payable, Current Depreciation and amortization Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three CLOSURE AND POST-CLOSURE LIABILITIES Closure and Post Closure Liabilities [Line Items] -- None. No documentation exists for this element. -- Accumulated Other Comprehensive Loss Total AOCI Attributable to Parent [Member] 2022 (nine months) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Inventories and supplies Increase (Decrease) in Inventories Common stock, outstanding shares (in shares) Common Stock, Shares, Outstanding Total cost of revenues Cost of Goods and Services Sold Revenues: Revenues [Abstract] Federal and State Enforcement Actions Federal and State Enforcement Actions [Member] The regulatory proceedings that are relating primarily to waste treatment, storage or disposal facilities. Measurement Period Adjustments, Deferred tax liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Additions to intangible assets including costs to obtain or renew permits Payments to Acquire Intangible Assets Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, before Tax, Attributable to Parent Inventory [Domain] Inventory [Domain] Number of sites not currently requiring expenditures on remediation Site Contingency, Not Requiring Environmental Remediation Expense Number of Sites Owned by Third Party The number of sites owned by the third party for which environmental remediation expense is not required. Expenditures Asset Retirement Obligation, Payments Asset Retirement Obligation, Payments Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Stockholders’ equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Interest rate swap, liability Interest Rate Cash Flow Hedge Liability at Fair Value Non-cash investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Customer and supplier relationships Customer Relationships [Member] Expenditures Accrual for Environmental Loss Contingencies, Payments Oil and oil related products Oil And Oil Related Products [Member] Oil And Oil Related Products Loss Contingencies [Line Items] Loss Contingencies [Line Items] PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Other long-term liabilities Other Liabilities, Noncurrent Number of performance stock awards that performance criteria not attained (in shares) Number Of Performance Stock Awards That Performance Criteria Not Attained Number Of Performance Stock Awards That Performance Criteria Not Attained Schedule of the Entity's Financial Arrangements Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal payments on debt Repayments of Long-term Debt Earnings per share: Earnings Per Share [Abstract] Pro forma combined revenues Business Acquisition, Pro Forma Revenue Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Buildings and improvements Buildings And Improvemens [Member] Buildings And Improvemens Document Quarterly Report Document Quarterly Report Other current and non-current assets Increase (Decrease) in Other Operating Assets Equipment Equipment [Member] Measurement Period Adjustments, Operating lease right-of-use assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Right-of-Use Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Right-of-Use Assets Proceeds from sale of available-for-sale securities Proceeds from Sale of Debt Securities, Available-for-sale Recorded reserves for actual or probable liabilities Loss Contingency Accrual Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Punitive damages sought Loss Contingency, Punitive Damages Sought, Value Loss Contingency, Punitive Damages Sought, Value Long-term debt, less current portion Long-term debt, at carrying value Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Stock-based compensation Share-based Payment Arrangement, Expense Weighted Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Accrual for Environmental Loss Contingencies [Roll Forward] Accrual for Environmental Loss Contingencies [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Remedial Liabilities (Including Superfund) for Non-Landfill Operations Remedial Liabilities (Including Superfund) for Non-Landfill Operations [Member] This element represents the details that pertain to the remedial liabilities for non-landfill sites. Environmental Services Environmental Services Environmental Services Segment [Member] Environmental Services [Member] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Construction in progress Construction in Progress [Member] Cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Balance beginning of period (in shares) Balance ending of period (in shares) Shares, Issued United States UNITED STATES Common stock, per value (in USD per share) Common stock, $0.01 par value: Common Stock, Par or Stated Value Per Share Safety-Kleen Sustainability Solutions Safety-Kleen Sustainability Solutions Safety-Kleen Sustainability Solutions Segment [Member] Safety-Kleen Sustainability Solutions Segment Accrued income, real estate, sales and other taxes Taxes Payable, Current Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Finite-lived intangible assets, cost Finite-Lived Intangible Assets, Gross Interest expense, net of interest income of $493 and $479, respectively Interest Income (Expense), Nonoperating, Net Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes") Senior Unsecured Notes due 2027 [Member] Senior Unsecured Notes due 2027 [Member] Entity Central Index Key Entity Central Index Key Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Security Exchange Name Security Exchange Name Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Schedule of Performance Stock Awards Schedule of Nonvested Performance-based Units Activity [Table Text Block] Revenue recognition Revenue from Contract with Customer [Policy Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Adjusted EBITDA Income (Loss) from Continuing Operations before Interest, Tax, Depreciation and Amortization, Net This element represents the income or loss from continuing operations before interest, taxes, depreciation and amortization to the economic entity. Shares used to compute earnings per share - Diluted (in shares) Dilutive shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted INCOME TAXES Income Tax Disclosure [Text Block] Accrued interest Interest Payable, Current Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Unrealized (Loss) Gain on Interest Rate Hedge Unrealized loss on interest rate hedge Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Other liabilities: Other Liabilities, Noncurrent [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes") Senior Unsecured Notes due 2029 [Member] Senior Unsecured Notes due 2029 [Member] Operating lease liabilities, less current portion Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating Lease, Less Current Portion Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating Lease, Less Current Portion Numerator for basic and diluted earnings per share: Numerator for Basic and Diluted Earnings Per Share [Abstract] -- None. No documentation exists for this element. -- Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Cash flows (used in) from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Total current liabilities Liabilities, Current Tax payments related to withholdings on vested restricted stock Payment, Tax Withholding, Share-based Payment Arrangement Intersegment revenues, net Intersegment Eliminations [Member] Camp equipment Camp Equipment [Member] Represents the industrial lodging facilities that are utilized in the entity's Industrial Services segment to provide lodging services to companies in the refinery and petrochemical industries. Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Schedule of Finite-lived and Indefinite-lived Intangible Assets [Table] Schedule of Finite-lived and Indefinite-lived Intangible Assets [Table] Schedule of Finite-lived and Indefinite-lived Intangible Assets [Table] Revolving credit facility maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Loss Contingencies [Table] Loss Contingencies [Table] Denominator: Denominator for Basic and Diluted Earnings Per Share [Abstract] -- None. No documentation exists for this element. -- Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Unamortized debt issuance costs and discount, net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Balance at January 1, 2022 Balance at March 31, 2022 Accrual for Environmental Loss Contingencies Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Cover [Abstract] Cover [Abstract] Unbilled accounts receivable Contract assets (unbilled receivables) Unbilled Accounts Receivable, Current The aggregate amount of unbilled receivables due for services rendered or to be rendered at the financial statement date, which are usually due within one year (or one business cycle). Superfund Proceedings Superfund Proceedings [Member] Represents the indemnification obligations under federal or state Superfund laws. Finite-lived intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Balance at January 1, 2022 Balance at March 31, 2022 Goodwill Currency translation and other Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) Schedule of Changes to Goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile net income to net cash (used in) from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Changes in environmental liability estimates Other Increase (Decrease) in Environmental Liabilities Right-of-Use assets, finance leases Finance Lease, Right-of-Use Asset, before Accumulated Amortization Measurement Period Adjustments, Other long-term liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities, Other Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities, Other Unrealized Loss on Unfunded Pension Liability Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accretion Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] [Line Items] for Schedule of Finite-lived and Indefinite-lived Intangible Assets [Table] Inventory [Line Items] Inventory [Line Items] Deferred income taxes Deferred Income Tax Expense (Benefit)