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Inventory (Schedule Of Inventories) (Details) - USD ($)
$ in Millions
Sep. 28, 2018
Sep. 29, 2017
Inventory, Net [Abstract]    
Raw materials $ 20.2 $ 24.6
Work-in-process 340.7 330.6
Finished goods 124.8 123.0
Finished goods held on consignment by customers 4.5 15.3
Total inventories $ 490.2 $ 493.5