Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended							3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 30, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Mar. 30, 2013 Developed Technology [Member]	Dec. 31, 2012 Developed Technology [Member]	Mar. 30, 2013 Other Intangible Assets [Member]		Dec. 31, 2012 Other Intangible Assets [Member]		Mar. 30, 2013 Trade Names [Member]	Dec. 31, 2012 Trade Names [Member]	Mar. 30, 2013 Minimum [Member] Other Intangible Assets [Member]	Mar. 30, 2013 Maximum [Member] Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted-Average Life				11 years	11 years	5 years	5 years
Gross Carrying Amount	$ 515,704		$ 518,424	$ 323,722	$ 325,509	$ 10,416	$ 11,154	$ 2,566	[1]	$ 2,761	[1]	$ 179,000	$ 179,000
Accumulated Amortization	(111,732)		(104,391)	(107,157)	(100,172)	(2,845)	(2,508)	(1,730)	[1]	(1,711)	[1]	0	0
Net	403,972		414,033	216,565	225,337	7,571	8,646	836	[1]	1,050	[1]	179,000	179,000
Finite-Lived Intangible Assets, Useful Life														1 year	3 years
Amortization of Intangible Assets	$ 8,957	$ 9,671

[1] Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.