Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

Business Combinations and Investments Goodwill and Acquired Intangible Assets (Details Textual) In Millions, unless otherwise specified	9 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2012 USD ($)	Oct. 02, 2011 USD ($)	Jan. 01, 2012 USD ($)	Aug. 03, 2012 Le Croy Corporation [Member] USD ($)	Jun. 30, 2011 Le Croy Corporation [Member] USD ($)	Aug. 03, 2012 Parent Company of Pdm Neptec [Member] USD ($)	Mar. 31, 2012 Parent Company of Pdm Neptec [Member] GBP (£)	Jul. 03, 2012 Blue View Technologies [Member] USD ($)	Jan. 01, 2012 Blue View Technologies [Member] USD ($)	Feb. 11, 2011 DALSA Corporation ("DALSA") [Member] USD ($)	Jan. 02, 2011 DALSA Corporation ("DALSA") [Member] CAD	Apr. 03, 2012 Optech Incorporated [Member] USD ($)	Mar. 30, 2012 Optech Incorporated [Member] CAD	Sep. 30, 2012 Optech Incorporated [Member]	Jan. 01, 2012 Optech Incorporated [Member]	Feb. 25, 2012 VariSystems Inc [Member] USD ($)	Sep. 30, 2012 VariSystems Inc [Member] USD ($)	May 31, 2011 VariSystems Inc [Member] CAD
Business Combinations and Investments, Goodwill and Acquired Intangible Assets (Textual) [Abstract]
Purchase of businesses and other investments	$ 389.2	$ 363.5
Payments to acquire businesses, net of cash acquired				301.3		7.4		16.3		339.5		27.9				34.9
Sales reported by acquired entity for last annual period					178.1		5.5		7.1		212.3		54.7					27.5
Percentage of ownership														51.00%	19.00%
Purchase price adjustment																	1.4
Business Combinations and Investments, Goodwill and Acquired Intangible Assets (Textual) [Abstract]
Goodwill, net	990.4		717.8
Acquired intangibles, net	$ 277.3		$ 181.4