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Balance Sheet Details - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment $ 135.7 $ 121.6  
Accumulated depreciation and amortization (68.6) (63.6)  
Total property and equipment, net 67.1 58.0  
Depreciation expense 12.0 11.8 $ 12.0
Land and buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment 11.9 12.1  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment 28.3 27.3  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 56.8 49.7  
Furniture and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment 6.3 5.1  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment 10.9 10.1  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 21.5 $ 17.3