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Derivative Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Mar. 27, 2020
Mar. 29, 2019
Sep. 27, 2019
Derivative [Line Items]          
Gain (loss) recognized in income $ (16,046) $ 5,936 $ (14,346) $ (1,684)  
Designated as Hedging Instrument | Cash Flow Hedging          
Derivative [Line Items]          
Net tax loss expected to be reclassified from accumulated other comprehensive loss     36,000    
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Gain (loss) recognized in income (12,873) 3,609 (8,973) (5,713)  
Interest rate swap agreements | Designated as Hedging Instrument          
Derivative [Line Items]          
Derivative, notional amount 3,300,000   3,300,000    
Interest rate swap agreements | Designated as Hedging Instrument | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, notional amount 800,000   800,000    
Cash flow hedge gain (loss)     (90,200)   $ (31,100)
Gain (loss) recognized in income (92,256) (21,524) (85,330) (52,525)  
Gasoline and diesel fuel agreements | Not Designated as Hedging Instrument          
Derivative [Line Items]          
Derivative, notional amount 20,700   20,700    
Gain (loss) recognized in income $ (12,100) $ 4,900 $ (9,000) $ (4,300)