Note 5 - Derivative Instruments (Details) - Fair Value Amounts of Derivative Instruments and Gains - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives assets designated as hedging instruments	$ 1,424	$ 1,406
Liabilities: Foreign Currency Forward Contracts
Derivatives liabilities designated as hedging instruments	1,072	626
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives assets designated as hedging instruments	972	114
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Assets [Member]
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives assets designated as hedging instruments	0	1,292
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accounts Payable and Accrued Liabilities [Member]
Liabilities: Foreign Currency Forward Contracts
Derivatives liabilities designated as hedging instruments	424	591
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Deferred Rent and Other Non-current Liabilities [Member]
Liabilities: Foreign Currency Forward Contracts
Derivatives liabilities designated as hedging instruments	$ 196	$ 0