Balance Sheet Details (Property, Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 120.8	$ 95.1
Accumulated depreciation and amortization	(35.2)	(22.6)
Total property, plant and equipment, net	85.6	72.5
Depreciation expense	14.1	10.0	3.7
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20.8	20.6
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17.2	17.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49.9	37.5
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12.2	8.3
Facility under capital lease
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1.6	1.0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13.3	8.2
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5.8	$ 1.7