Related Party Transactions (Details) (USD $)	4 Months Ended		9 Months Ended	4 Months Ended		4 Months Ended		12 Months Ended	4 Months Ended	12 Months Ended
	Sep. 18, 2012 restaurants	Sep. 20, 2011	May 29, 2012	Sep. 18, 2012 Chief executive officer	Aug. 30, 2012 Chief executive officer Trusts	Sep. 18, 2012 Chief Executive Trusts	Sep. 18, 2012 Board of Directors Chairman [Member]	Feb. 28, 2006 Blanche F. Maier--Chairman's widow	Sep. 18, 2012 Estate of Blanche F. Maier	Feb. 28, 2013 Estate of Blanche F. Maier	Feb. 29, 2012 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	$ 1,518,000	$ 1,521,000
Maximum number of days amounts due from related parties are settled	28 days
Due from related parties, current	56,000		92,000
Treasury shares aquired	212,929			32,000		23,500			8,500
Treasury shares aquired, value	6,779,485	588,206	54,308	1,034,000		759,000			275,000
Number of trusts beneficially owned by the Chief Executive Officer					4
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		19,436	19,149
Long-term deferred compensation liability									326,000
Current portion of deferred compensation liability							$ 215,000