Balance Sheet Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 107.6	$ 110.1
Accumulated depreciation and amortization	(57.8)	(53.9)
Total property and equipment, net	49.8	56.2
Depreciation expense	12.3	12.5	$ 13.3
Land and buildings
Property, Plant and Equipment [Line Items]
Property and equipment	12.2	13.3
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	26.9	27.0
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	47.2	47.4
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment	5.3	5.8
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	9.9	10.9
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 6.1	$ 5.7