Note 5 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands, CAD in Millions	3 Months Ended
	Nov. 28, 2015 USD ($)	Nov. 29, 2014 USD ($)	Nov. 28, 2015 CAD	Nov. 28, 2015 USD ($)	Aug. 29, 2015 USD ($)	[1]	Jan. 31, 2015 CAD Rate	Aug. 30, 2014 USD ($)
Forward Contracts [Member] | Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value				$ 700
Forward Contracts [Member]
Derivative, Number of Instruments Held							16
Derivative, Notional Amount | CAD			CAD 23.5				CAD 31.0
Accumulated Other Comprehensive Income (Loss), Net of Tax				400
Canadian Dollars to US Dollars [Member]
Derivative, Forward Exchange Rate | Rate							78.25%
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (10,122)		$ (26,498)	$ (24,413)			$ (2,533)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 72

[1] Derived from audited financial statements.