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Derivative Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Jun. 15, 2015
Derivative [Line Items]        
Payments to terminate derivative contract $ 23,551,000 $ 0 $ 0  
Interest Rate Swaps        
Derivative [Line Items]        
Payments to terminate derivative contract 23,600,000      
Interest rate swaps hedge ineffectiveness $ 0   $ 0  
Interest Rate Swap 1        
Derivative [Line Items]        
Derivative, notional amount       $ 500,000,000.0