Acquisitions and Purchase Accounting - Stewart Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Sep. 05, 2012 Stewart [Member]	Sep. 05, 2012 Stewart [Member] as initially reported [Member]	Sep. 05, 2012 Stewart [Member] Scenario, Adjustment [Member]
Business Acquisition [Line Items]
Cash				$ 244	$ 0	$ 244
Current assets				11,124	11,839	(715)
Property, plant and equipment				642	653	(11)
Goodwill	526,011	477,812	369,989	15,744	17,886	(2,142)
Other intangibles				10,160	6,850	3,310
Current liabilities				(5,697)	(5,228)	(469)
Other non-current liabilities				(4,217)	(4,000)	(217)
Consideration paid at closing				28,000	28,000	0
Contingent consideration				4,000	4,000	0
Net assets acquired and liabilities assumed				$ 32,000	$ 32,000	$ 0