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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. 29, 2019
Mar. 30, 2018
Mar. 29, 2019
Mar. 30, 2018
Derivative instruments        
(Gain) loss recognized in income $ (5,936) $ 3,860 $ 1,684 $ 1,891
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements        
Derivative instruments        
(Gain) loss recognized in income 21,524 (31,323) 52,525 (36,568)
Designated as Hedging Instrument | Cash Flow Hedging | Interest Expense | Interest rate swap agreements        
Derivative instruments        
(Gain) loss recognized in income (2,327) 2,821 (4,029) 4,917
Not Designated as Hedging Instrument        
Derivative instruments        
(Gain) loss recognized in income (3,609) 1,039 5,713 (3,026)
Not Designated as Hedging Instrument | Gasoline and diesel fuel agreements        
Derivative instruments        
(Gain) loss recognized in income (4,900) 1,700 4,300 (200)
Not Designated as Hedging Instrument | Interest Expense | Foreign currency forward exchange contracts        
Derivative instruments        
(Gain) loss recognized in income 66 1,100 244 451
Not Designated as Hedging Instrument | Cost of Services Provided and Selling and General Corporate Expense [Member] | Gasoline and diesel fuel agreements        
Derivative instruments        
(Gain) loss recognized in income $ (3,675) $ (61) $ 5,469 $ (3,477)