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Derivative Instruments - Location of (Gain) Loss Reclassified from AOCI Into Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Apr. 01, 2022 | Mar. 31, 2023 | Apr. 01, 2022
Derivative instruments |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of services provided (exclusive of depreciation and amortization) | Cost of services provided (exclusive of depreciation and amortization) | Cost of services provided (exclusive of depreciation and amortization) | Cost of services provided (exclusive of depreciation and amortization)
Gain (loss) recognized in income | $ (11,428) | $ 6,570 | $ (23,751) | $ 19,059
Interest rate swap agreements | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |
Derivative instruments |  |  |  |
Gain (Loss), reclassification, before tax | (13,915) | 10,550 | (24,230) | 23,004
Gasoline and diesel fuel agreements | Not Designated as Hedging Instrument |  |  |  |
Derivative instruments |  |  |  |
Gain (loss) recognized in income | $ 2,487 | $ (3,980) | $ 479 | $ (3,945)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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