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Balance Sheet Components (Intangibles, Other Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangibles $ 2.5 $ 3.2 $ 5.0 $ 7.7