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Commitments and Contingencies and Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
Jul. 28, 2015
Sep. 28, 2018
Loss Contingencies [Line Items]    
Lease Term 10 years  
Letter of Credit    
Loss Contingencies [Line Items]    
Line of credit facility, amount outstanding   $ 2.5
Letter of Credit | Committed And Uncommitted Letter Of Credit Facility    
Loss Contingencies [Line Items]    
Line of credit facility, amount outstanding   444.1
Line of Credit    
Loss Contingencies [Line Items]    
Letters of credit outstanding   446.6
Surety Bond    
Loss Contingencies [Line Items]    
Letters of credit outstanding   $ 870.3