Business Acquisitions, Goodwill and Acquired Intangible Assets (Details 1) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 30, 2012		Jan. 01, 2012		Dec. 30, 2012 LeCroy [Member]		Dec. 30, 2012 PDM Neptec [Member]		Dec. 30, 2012 Blue View [Member]		Dec. 30, 2012 Optech [Member]		Dec. 30, 2012 VariSystems [Member]		Jan. 01, 2012 DALSA [Member]		Jan. 01, 2012 Nova Sensors [Member]
Business Acquisition [Line Items]
Acquisition date					Aug. 03, 2012		Aug. 03, 2012		Jul. 02, 2012		Apr. 02, 2012		Feb. 25, 2012		Feb. 11, 2011		Mar. 17, 2011
Purchase price	$ 389.2	[1]	$ 344.6	[1]	$ 301.3	[1]	$ 7.4	[1]	$ 16.3	[1]	$ 27.9	[1]	$ 36.3	[1]	$ 339.5	[1]	$ 5.1	[1]
Goodwill	265.1		175.2		174.4		3.3		10.8		62.4		14.2		166.9		8.3
Acquired intangible assets	$ 109.0		$ 93.5		$ 67.6		$ 1.3		$ 4.8		$ 23.4		$ 11.9		$ 91.5		$ 2.0

[1] Includes transaction costs that were expensed.