Supplemental Cash Flow Information (Details) (USD $)	0 Months Ended	9 Months Ended
	May 16, 2011	Sep. 23, 2012	Sep. 25, 2011
Supplemental Cash Flow Information [Abstract]
Interest		$ 8,194,000	$ 5,660,000
Income tax payments		8,229,000	9,309,000
Finite-Lived Intangible Assets [Line Items]
Business acquisition, purchase price	78,700,000
Cash acquired on acquisition	1,900,000
Business acquisition, contingent consideration, potential cash payment	17,500,000		27,800,000
Assumption of debt	4,200,000
Capital Expenditures Incurred but Not yet Paid		600,000	3,000,000
Purchase Price Funded By Cash [Member]
Finite-Lived Intangible Assets [Line Items]
Business acquisition, purchase price	66,700,000
Purchase Price Funded By Senior Secured Credit Facility [Member]
Finite-Lived Intangible Assets [Line Items]
Business acquisition, purchase price	$ 9,200,000