Acquisitions and Purchase Accounting - Nieco Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Oct. 31, 2012 Nieco [Member]
Business Acquisition [Line Items]
Cash				$ 140
Current assets				4,011
Property, plant and equipment				268
Goodwill	526,011	477,812	369,989	18,855
Other intangibles				5,620
Current liabilities				(1,836)
Other non-current liabilities				(3,058)
Consideration paid at closing				24,000
Contingent consideration				3,058
Net assets acquired and liabilities assumed				$ 27,058