Business Acquisitions, Goodwill And Intangible Assets (Details 1) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Jan. 01, 2012	Jan. 02, 2011	Jan. 01, 2012 Nova Sensors [Member]	Jan. 01, 2012 DALSA Corporation ("DALSA") [Member]	Jan. 02, 2011 Optimum Optical [Member]	Jan. 02, 2011 Intelek [Member]	Jan. 02, 2011 Gavia [Member]
Business Acquisitions, Goodwill and Intangible Assets
Acquisition Date			2011-02-11	2011-03-17	2010-06-07	2010-07-26	2010-09-20
Purchase price	$ 347.4	$ 60.0	$ 342.3	$ 5.1	$ 5.7	$ 43.5	$ 10.8
Goodwill	175.2	46.4	166.9	8.3	4.3	34.0	8.1
Acquired intangible assets	$ 93.5	$ 19.5	$ 91.5	$ 2.0	$ 1.9	$ 15.3	$ 2.3