Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended		12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011	Aug. 25, 2012 Notes Payable Other [Member]	Aug. 27, 2011 Notes Payable Other [Member]	Aug. 25, 2012 Line of Credit [Member]	Aug. 27, 2011 Line of Credit [Member]	Aug. 27, 2011 Fixed Rate Note [Member]	Aug. 27, 2011 Prior Credit Agreement [Member]	Aug. 25, 2012 Floating Rate Note [Member]	Aug. 27, 2011 Floating Rate Note [Member]
Debt Instrument [Line Items]
Long-term debt	$ 104,685	$ 120,296	$ 4,685	$ 5,296	$ 0	$ 15,000			$ 100,000	$ 100,000
Less - current maturities	4,530	20,133
Long term debt, net of current maturities	100,155	100,163
Line of Credit					250,000			225,000
Line of credit facility, amount outstanding					0
Outstanding letters of credit	43,700	39,200			43,700
Amount available for borrowing					206,300
Issuance of floating rate notes									100,000
Maturity date					May 04, 2016		Jun. 14, 2011	Sep. 13, 2011	Sep. 14, 2013
Interest rate							5.27%
Terms					LIBOR plus 100 basis points at the time of the respective borrowing				LIBOR plus 50 basis points
Repayment of fixed rate note cash reserves							45,000
Repayment of fixed rate note credit line borrowing							30,000
Debt instrument, maturity date range end									two years
Current maturities of long-term debt for the next five fiscal years [Abstract]
2013	4,530
2014	100,000
2015	0
2016	0
2017	0
Thereafter	155
Total	$ 104,685	$ 120,296	$ 4,685	$ 5,296	$ 0	$ 15,000			$ 100,000	$ 100,000