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Certain Balance Sheet Components (Components Of Net Inventories) (Details) - USD ($)
$ in Millions
Dec. 29, 2017
Dec. 30, 2016
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 85.4 $ 77.9
Work-in-process 12.4 6.8
Finished goods 174.0 134.1
Total inventories 271.8 218.8
Deferred Costs, Current $ 16.6 $ 14.4