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Inventory (Schedule Of Inventories) (Details) - USD ($)
$ in Millions
Dec. 30, 2016
Sep. 30, 2016
Inventory, Net [Abstract]    
Raw materials $ 19.8 $ 18.5
Work-in-process 257.8 255.5
Finished goods 135.5 140.4
Finished goods held on consignment by customers 9.7 9.6
Total inventory $ 422.8 $ 424.0