Acquisitions and Purchase Accounting - Drake Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 02, 2011 Drake [Member]	Dec. 02, 2011 Drake [Member] as initially reported [Member]	Dec. 02, 2011 Drake [Member] Measurement Period Adjustments [Member]
Business Acquisition [Line Items]
Cash				$ 427	$ 427	$ 0
Deferred tax asset				446	390	56
Current assets				4,032	4,245	(213)
Property, plant and equipment				1,773	1,773	0
Goodwill	526,011	477,812	369,989	15,711	15,237	474
Other intangibles				5,810	5,810	0
Other assets				9	9	0
Current liabilities				(3,280)	(3,334)	54
Long-term deferred tax liability				(2,363)	(2,395)	32
Net assets acquired and liabilities assumed				$ 22,565	$ 22,162	$ 403