Long-term Debt (Details) (USD $)			12 Months Ended					12 Months Ended			12 Months Ended
	Aug. 27, 2011	Aug. 28, 2010	Aug. 28, 2010 Series A, Fixed Rate Notes [Member]	Aug. 27, 2011 Series D, Floating Rate Note [Member]	Aug. 28, 2010 Series D, Floating Rate Note [Member]	Aug. 27, 2011 Notes Payable Other [Member]	Aug. 28, 2010 Notes Payable Other [Member]	Aug. 27, 2011 Line of Credit [Member]	Aug. 28, 2004 Fixed Rate Note [Member]	Jun. 14, 2004 Fixed Rate Note [Member]	Aug. 27, 2011 Prior Credit Agreement [Member]	Aug. 25, 2007 Floating Rate Note [Member]
Debt Instrument [Line Items]
Long-term debt	$ 120,296,000	$ 181,464,000	$ 75,000,000	$ 100,000,000	$ 100,000,000	$ 5,296,000	$ 6,464,000	$ 15,000,000		$ 75,000,000
Less - current maturities	20,133,000	81,160,000
Long term debt, net of current maturities	100,163,000	100,304,000
Line of Credit								250,000,000			225,000,000
Line of credit facility, amount outstanding								15,000,000
Outstanding letters of credit	39,200,000	35,900,000						39,200,000
Amount available for borrowing								195,800,000
Issuance of floating rate notes												100,000,000
Maturity date			Jun. 14, 2011	Sep. 14, 2013	Sep. 14, 2013			May 04, 2016			Sep. 13, 2011	Sep. 14, 2013
Interest rate			5.27%					1.40%		5.27%
Terms								LIBOR plus 125 basis points at the time of the respective borrowing.				LIBOR plus 50 basis points
Basis spread on variable rate				0.75%	1.40%
Repayment of fixed rate note cash reserves									45,000,000
Repayment of fixed rate note credit line borrowing									30,000,000
Debt instrument, maturity date range end									seven years			two years
Current maturities of long-term debt for the next five fiscal years [Abstract]
2012	20,133,000
2013	0
2014	100,000,000
2015	0
2016	0
Thereafter	163,000
Total	$ 120,296,000	$ 181,464,000	$ 75,000,000	$ 100,000,000	$ 100,000,000	$ 5,296,000	$ 6,464,000	$ 15,000,000		$ 75,000,000