Note 6 - Derivative Instruments and Hedging Activities (Details Textual) CAD in Millions	12 Months Ended
	Aug. 27, 2016 USD ($)	Aug. 29, 2015 USD ($)	Aug. 30, 2014 USD ($)	Aug. 27, 2016 CAD	Aug. 27, 2016 USD ($)		Jan. 31, 2015 CAD Rate
Forward Contracts [Member] | Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value					$ 100,000
Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value					100,000
Forward Contracts [Member]
Derivative, Number of Instruments Held							16
Derivative, Notional Amount | CAD				CAD 17.1			CAD 31.0
Accumulated Other Comprehensive Income (Loss), Net of Tax					100,000
Canada, Dollars
Derivative, Forward Exchange Rate | Rate							78.25%
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (24,413,000)	$ (2,533,000)		$ (28,949,000)	[1]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 215,000	$ (21,000)

[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.