Balance Sheet Details - Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Property, Plant and Equipment [Line Items]
Property and equipment	$ 143.3	$ 134.9
Accumulated depreciation and amortization	(60.7)	(50.1)
Total property and equipment, net	82.6	84.8
Depreciation expense	16.6	17.2	14.1
Land and buildings
Property, Plant and Equipment [Line Items]
Property and equipment	21.8	21.0
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	27.0	20.0
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	59.8	59.0
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment	12.9	15.4
Facility under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment	0	1.0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	13.8	13.7
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 8.0	$ 4.8