Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013	Dec. 29, 2013	Jan. 21, 2014 Xsens Holdings BV	Jun. 29, 2014 Xsens Holdings BV	Jun. 29, 2014 Xsens Holdings BV
Business Acquisition [Line Items]
Business acquisition, cash payment						$ 61.2		$ 61.2
Acquisitions, net of cash acquired			60.0					60.0
Cash acquired from acquisition								1.2
Amortization of acquisition-related intangibles	2.2	3.9	6.4	7.7			0.9	1.5
Goodwill	$ 213.7		$ 213.7		$ 169.3		$ 44.4	$ 44.4