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Description Of Business and Basis Of Presentation (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 29, 2019
Sep. 28, 2018
Supplemental Cash Flow Elements [Abstract]    
Asset retirement obligations, noncurrent $ 13.9 $ 13.9
Capital expenditures incurred but not yet paid $ 38.1 $ 94.1