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Derivative Instruments - Location of (Gain) Loss Reclassified from AOCI Into Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Derivative instruments    
Gain (loss) recognized in income $ (1,700) $ 7,620
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements    
Derivative instruments    
Gain (loss) recognized in income (6,926) 31,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Expense | Interest rate swap agreements    
Derivative instruments    
Gain (loss) recognized in income 2,200 (1,702)
Not Designated as Hedging Instrument    
Derivative instruments    
Gain (loss) recognized in income (3,900) 9,322
Not Designated as Hedging Instrument | Gasoline and diesel fuel agreements    
Derivative instruments    
Gain (loss) recognized in income (3,100) 9,200
Not Designated as Hedging Instrument | Interest Expense | Foreign currency forward exchange contracts    
Derivative instruments    
Gain (loss) recognized in income (102) 178
Not Designated as Hedging Instrument | Cost of services provided | Gasoline and diesel fuel agreements    
Derivative instruments    
Gain (loss) recognized in income $ (3,798) $ 9,144