Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 13, 2012 Interger	Aug. 15, 2011	Aug. 13, 2012 Interger	Aug. 15, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense related to Units that contain performance conditions	$ 555	$ 480	$ 1,295	$ 1,247
Share-based compensation expense for Units excluding performance conditions	509	519	1,186	1,221
Total share-based compensation expense	1,064	999	2,481	2,468
Number of vesting periods for performance vesting Units converted to time vesting Units	2		2
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Maximum unrecognized compensation cost for all unvested Units	$ 7,684		$ 7,684