Note 5 - Loans Payable and Long-term Debt (Details) - USD ($) $ in Thousands			12 Months Ended
	May. 05, 2011	Sep. 14, 2006	Aug. 29, 2015	Aug. 30, 2014
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Loans Payable, Current			$ 1,385	$ 7,704
Long-term Debt, Excluding Current Maturities			0	155
Letters of Credit Outstanding, Amount			52,900	$ 49,600
Credit Agreement [Member]
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Letters of Credit Outstanding, Amount			$ 52,900
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.75%
Credit Agreement [Member] | Revolving Credit Facility [Member]
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000
Debt Instrument, Maturity Date	May 04, 2016
Long-term Line of Credit			$ 0
Line of Credit Facility, Remaining Borrowing Capacity			$ 197,100
Floating Rate Note [Member]
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Debt Instrument, Maturity Date		Sep. 14, 2013
Proceeds from Issuance of Debt		$ 100,000
Floating Rate Note [Member] | London Interbank Offered Rate (LIBOR) [Member]
Note 5 - Loans Payable and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%