Debt And Other Obligations (Long-Term Debt And Capital Leases) (Details) (USD $)				4 Months Ended
	Apr. 21, 2012	Mar. 27, 2012	Dec. 31, 2011	Apr. 21, 2012 4.375% Senior Notes Due 2022 [Member]	Apr. 21, 2012 Standby Letters Of Credit [Member]	Dec. 31, 2011 Standby Letters Of Credit [Member]
Debt Instrument [Line Items]
Unsecured credit facility			$ 225,000,000
Unsecured term loan	82,500,000		90,000,000
4.375% Senior notes due 2022	399,045,000
Capital lease obligations	13,260,000		9,272,000
Other notes payable	1,766,000		1,902,000
Total debt	496,571,000		326,174,000
Less current maturities of long-term debt	53,571,000		42,768,000
Total long-term debt	443,000,000		283,406,000
Interest rate		4.375%		4.375%
Final Maturity				2022
Bank overdraft balance	1,100,000		10,200,000
Line of credit facility, outstanding borrowings					$ 14,300,000	$ 14,700,000