Goodwill And Other Intangibles (Schedule Of Changes To Goodwill) (Details) (USD $) In Thousands	9 Months Ended
Oct. 01, 2011	Oct. 02, 2010
Goodwill [Line Items]
Beginning balance	$ 775,371	$ 663,920
Acquisitions		39,492
Acquisitions and Valuation Adjustments	369,611
Translation Adjustments	(9,280)	7,831
Ending balance	1,135,702	711,243
Electrical Segment [Member]
Goodwill [Line Items]
Beginning balance	763,135	663,920
Acquisitions		28,823
Acquisitions and Valuation Adjustments	369,546
Translation Adjustments	(8,921)	7,239
Ending balance	1,123,760	699,982
Mechanical Segment [Member]
Goodwill [Line Items]
Beginning balance	12,236
Acquisitions		10,669
Acquisitions and Valuation Adjustments	65
Translation Adjustments	(359)	592
Ending balance	$ 11,942	$ 11,261

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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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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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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