Note 5 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands, CAD in Millions	3 Months Ended		6 Months Ended
	Feb. 27, 2016 USD ($)	Feb. 28, 2015 USD ($)	Feb. 27, 2016 USD ($)	Feb. 28, 2015 USD ($)	Feb. 27, 2016 CAD	Feb. 27, 2016 USD ($)		Nov. 28, 2015 USD ($)	Aug. 29, 2015 USD ($)	[2]	Jan. 31, 2015 CAD Rate	Nov. 29, 2014 USD ($)	Aug. 30, 2014 USD ($)
Forward Contracts [Member] | Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value						$ 500
Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value						300
Forward Contracts [Member]
Derivative, Number of Instruments Held											16
Derivative, Notional Amount | CAD					CAD 21.2						CAD 31.0
Accumulated Other Comprehensive Income (Loss), Net of Tax						500
Canadian Dollars to US Dollars [Member]
Derivative, Forward Exchange Rate | Rate											78.25%
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (21,335)		$ (21,335)		$ (28,427)	[1]	$ (26,498)	$ (24,413)			$ (10,122)	$ (2,533)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 93		$ 165

[1] In the second fiscal quarter of 2016, the Company adopted updated accounting guidance on the presentation of deferred income taxes. This adoption required that deferred tax liabilities and assets be classified as noncurrent in the Consolidated Balance Sheet. The Company elected to account for this change in presentation prospectively and prior periods were not retroactively adjusted.

[2] Derived from audited financial statements