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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
Mar. 27, 2020
Mar. 29, 2019
Mar. 27, 2020
Mar. 29, 2019
Derivative instruments        
Gain (loss) recognized in income $ 16,046 $ (5,936) $ 14,346 $ 1,684
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements        
Derivative instruments        
Gain (loss) recognized in income 92,256 21,524 85,330 52,525
Designated as Hedging Instrument | Cash Flow Hedging | Interest Expense | Interest rate swap agreements        
Derivative instruments        
Gain (loss) recognized in income 3,173 (2,327) 5,373 (4,029)
Not Designated as Hedging Instrument        
Derivative instruments        
Gain (loss) recognized in income 12,873 (3,609) 8,973 5,713
Not Designated as Hedging Instrument | Gasoline and diesel fuel agreements        
Derivative instruments        
Gain (loss) recognized in income 12,100 (4,900) 9,000 4,300
Not Designated as Hedging Instrument | Interest Expense | Foreign currency forward exchange contracts        
Derivative instruments        
Gain (loss) recognized in income 170 66 68 244
Not Designated as Hedging Instrument | Cost of services provided | Gasoline and diesel fuel agreements        
Derivative instruments        
Gain (loss) recognized in income $ 12,703 $ (3,675) $ 8,905 $ 5,469