Related Party Transactions (Details) (USD $)	4 Months Ended	12 Months Ended				0 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended
	Sep. 18, 2012	May 28, 2013 restaurant	May 29, 2012	May 31, 2011	Aug. 30, 2012 Trust	Aug. 30, 2012 Chief executive officer	Aug. 30, 2012 Chief Executive Trusts	May 28, 2013 Board of Directors Chairman [Member]	Feb. 28, 2006 Blanche F. Maier--Chairman's widow	Aug. 30, 2012 Estate of Blanche F. Maier	Feb. 28, 2013 Estate of Blanche F. Maier	Feb. 29, 2012 Estate of Blanche F. Maier	May 28, 2013 Estate of Blanche F. Maier
Related Party Transaction [Line Items]
Number of restaurants licensed to related parties and operated by the Company		3
Purchases by related party		$ 4,963,000	$ 5,217,000	$ 5,002,000
Due from related parties, current		34,000	92,000
Maximum number of days amounts due from related parties are settled		28 days
Treasury shares acquired	212,929					32,000	23,500			8,500
Number of trusts beneficially owned by the Chief Executive Officer					4
Treasury shares acquired, value		6,826,858	642,514	4,680,224		1,034,000	759,000			275,000
Deferred compensation with related parties, maximum benefit period								10 years
Annual payments due to related parties, excluding consumer price Index adjustments								214,050
Percentage of consumer price index change reflected in deferred compensation payments								50.00%
Monthly payments due to related parties, subject to consumer price index adjustment									17,838		19,601	19,436
Long-term deferred compensation liability													158,000
Current portion of deferred compensation liability								$ 230,000