Summary of Acquired Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 28, 2014	Dec. 29, 2013
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Gross Carrying Amount	$ 367.8	$ 350.9
Goodwill	211.3	169.3
Identifiable intangible assets, Accumulated Amortization	(327.8)	(319.2)
Identifiable intangible assets, including goodwill, Gross Carrying Amount	579.1	520.2
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Gross Carrying Amount	261.8	250.8
Identifiable intangible assets, Accumulated Amortization	(244.5)	(240.0)
Developed Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	3 years
Developed Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	15 years
Customer Base
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Gross Carrying Amount	86.4	81.6
Identifiable intangible assets, Accumulated Amortization	(76.5)	(73.6)
Customer Base | Minimum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	6 years
Customer Base | Maximum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	10 years
Core Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Gross Carrying Amount	15.7	15.7
Identifiable intangible assets, Accumulated Amortization	(6.0)	(5.1)
Core Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	10 years
Core Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	15 years
In Process R&D
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	10 years
Identifiable intangible assets, Gross Carrying Amount	3.3	2.8
Identifiable intangible assets, Accumulated Amortization	(0.7)	(0.5)
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Period of Amortization	5 years
Identifiable intangible assets, Gross Carrying Amount	0.6
Identifiable intangible assets, Accumulated Amortization	$ (0.1)