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Derivative Instruments - Location of (Gain) Loss Reclassified from AOCI Into Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Jan. 01, 2021
Derivative instruments    
Gain (loss) recognized in income $ 12,541 $ 11,826
Not Designated as Hedging Instrument    
Derivative instruments    
Gain (loss) recognized in income 87 (1,739)
Not Designated as Hedging Instrument | Gasoline and diesel fuel agreements    
Derivative instruments    
Gain (loss) recognized in income (1,600) (3,600)
Not Designated as Hedging Instrument | Interest Expense | Foreign currency forward exchange contracts    
Derivative instruments    
Gain (loss) recognized in income 52 402
Not Designated as Hedging Instrument | Cost of Services Provided and Selling and General Corporate Expenses | Gasoline and diesel fuel agreements    
Derivative instruments    
Gain (loss) recognized in income 35 (2,141)
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swap agreements    
Derivative instruments    
Gain (loss) recognized in income (18,326) 1,242
Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense | Interest rate swap agreements    
Derivative instruments    
Gain (Loss), reclassification, before tax $ 12,454 $ 13,565