Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended				9 Months Ended				1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2010	Oct. 01, 2011		Oct. 02, 2010		Oct. 01, 2011		Oct. 02, 2010		Jun. 30, 2011 Seed [Member]	Oct. 01, 2011 Acquisitions 2011 [Member]	Oct. 01, 2011 Acquisitions 2011 [Member]	Oct. 01, 2011 RFPD and NuHorizons Combined [Member]	Oct. 01, 2011 RFPD and NuHorizons Combined [Member]	Mar. 01, 2011 RFPD [Member]	Jan. 03, 2011 Nu Horizons [Member]	Oct. 01, 2011 Nu Horizons [Member]	Oct. 02, 2010 Acquisitions 2010 [Member]	Oct. 02, 2010 Acquisitions 2010 [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents																$ 18,085
Business Acquisition, Purchase Price Allocation, Debt Paid																26,375
Business Acquisition, Purchase Price Allocation, Assets Acquired																162,880
Business Acquisition, Cost of Acquired Entity, Purchase Price															235,973	161,125
Sales		5,186,857		4,657,841		15,949,791		13,506,514					231,738	661,134
Net income attributable to shareholders		132,216		118,502		424,722		321,741
Basic		$ 1.17		$ 1.01		$ 3.7		$ 2.71
Diluted		$ 1.15	[1]	$ 1	[1]	$ 3.64	[1]	$ 2.68	[1]
Business Combination, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue											5,200,002	16,114,096						5,077,977	15,025,717
Business Acquisition, Pro Forma Net Income (Loss)											132,128	428,486						126,422	346,620
Business Acquisition, Pro Forma Earnings Per Share, Basic											$ 1.17	$ 3.74						$ 1.08	$ 2.92
Business Acquisition, Pro Forma Earnings Per Share, Diluted											$ 1.15	$ 3.68						$ 1.07	$ 2.88
Number of Sales Facilities										14
Number of Value Added Engineers										100
Number of Employees										200					400	700
Gain on bargain purchase		0		0		1,755		0								1,755
Gain on bargain purchase, net of taxes						1,078		0								1,078
Gain on Purchase of Business, Per Share Basic																$ 0.01
Gain on Purchase of Business, Per Share Diluted																	$ 0.01
Amortization of Intangible Assets		9,268		5,342		25,431		14,636
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period										90,000
Payments to acquire additional interest in majority-owned subsidiary	$ 3,060

[1] (a)Stock-based compensation awards for the issuance of 1,815 and 1,017 shares for the third quarter and first nine months of 2011 and 4,455 and 3,281 shares for the third quarter and first nine months of 2010, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.