Business Acquisitions, Goodwill and Intangible Assets (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	12 Months Ended
Jan. 01, 2012	Jan. 02, 2011	Jan. 01, 2012 Instrumentation [Member]	Jan. 02, 2011 Instrumentation [Member]	Jan. 01, 2012 Digital Imaging [Member]	Jan. 02, 2011 Digital Imaging [Member]	Jan. 01, 2012 Aerospace and Defense Electronics [Member]	Jan. 02, 2011 Aerospace and Defense Electronics [Member]	Jan. 02, 2011 Engineered Systems [Member]	Jan. 01, 2012 Engineered Systems [Member]
Summary of changes in the carrying value of goodwill
Goodwill, Beginning Balance	$ 546.3	$ 501.5	$ 271.6	$ 264.8	$ 89.9	$ 85.6		$ 135.3	$ 15.8	$ 23.7
Current year acquisitions	175.2	46.4		8.1	175.2	4.3		26.1	7.9
Impact of foreign currency changes	(3.7)	(1.5)	(0.1)	(1.2)	(3.9)		0.3	(0.3)
Adjustment to prior year acquisitions		(0.1)		(0.1)
Goodwill, Ending Balance	$ 717.8	$ 546.3	$ 271.5	$ 271.6	$ 261.2	$ 89.9	$ 161.4	$ 161.1	$ 23.7	$ 23.7

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details