Gross Carrying Amount and Accumulated Amortization of Intangible Assets Subject to Amortization (Detail) (USD $) In Millions, unless otherwise specified	Jun. 29, 2012	Dec. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 178.5	$ 258.6
Accumulated Amortization	(172.0)	(201.5)
Net	6.5	57.1
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	147.6	212.8
Accumulated Amortization	(147.3)	(169.1)
Net	0.3	43.7
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	30.9	35.2
Accumulated Amortization	(24.7)	(23.7)
Net	6.2	11.5
Trade names/trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Assets		0.2
Accumulated Amortization		(0.2)
Leasehold improvements
Finite-Lived Intangible Assets [Line Items]
Gross Assets		(2.7)
Accumulated Amortization		2.3
Net		(0.4)
Non-compete arrangements
Finite-Lived Intangible Assets [Line Items]
Gross Assets		13.1
Accumulated Amortization		(10.8)
Net		$ 2.3