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Derivative Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Jun. 30, 2015
Derivative [Line Items]        
Payments to terminate derivative contract $ 0 $ 23,551,000 $ 0  
Interest Rate Swap 1        
Derivative [Line Items]        
Derivative, notional amount       $ 500,000,000.0
Interest Rate Swaps        
Derivative [Line Items]        
Payments to terminate derivative contract   23,600,000    
Interest rate swaps hedge ineffectiveness   $ 0 $ 0