Identifiable Intangible Assets Acquired and their Useful Lives (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 29, 2014
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Weighted Average useful life	5 years
In Process R&D
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets, Weighted Average useful life	10 years
Xsens Holdings BV
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 17.6
Xsens Holdings BV | Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	11.4
Identifiable intangible assets, Weighted Average useful life	3 years
Xsens Holdings BV | Customer Base
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	5.0
Identifiable intangible assets, Weighted Average useful life	4 years
Xsens Holdings BV | Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	0.6
Identifiable intangible assets, Weighted Average useful life	5 years
Xsens Holdings BV | Finite-Lived Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	17.0
Xsens Holdings BV | In Process R&D
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 0.6