Note 5 - Derivative Instruments and Hedging Activities (Details) $ in Thousands, CAD in Millions	3 Months Ended		9 Months Ended
	May. 30, 2015 USD ($)	May. 31, 2014 USD ($)	May. 30, 2015 USD ($)	May. 31, 2014 USD ($)	May. 30, 2015 CAD	Feb. 28, 2015 USD ($)	Jan. 31, 2015 CAD	Aug. 30, 2014 USD ($)	[1]	Mar. 01, 2014 USD ($)	Aug. 31, 2013 USD ($)
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (20,984)	$ (632)	$ (20,984)	$ (632)		$ (21,335)		$ (2,533)		$ (2,970)	$ 1,445
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(70)	$ 0	(70)	$ 0
Canadian Dollars to US Dollars [Member]
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Forward Exchange Rate							0.7825
Forward Contracts [Member]
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Number of Instruments Held							16
Derivative, Notional Amount (in Dollars) | CAD					CAD 27.8		CAD 31.0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(400)		(400)
Forward Contracts [Member] | Current Accrued Liabilities [Member]
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	$ 600		$ 600

[1] Derived from audited financial statements