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Note 6 - Derivative Instruments (Details Textual)
$ in Thousands, € in Millions, £ in Millions, ₱ in Billions, ₨ in Billions
3 Months Ended 12 Months Ended
Aug. 31, 2020
May 31, 2020
Feb. 28, 2020
Nov. 30, 2019
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2019
GBP (£)
Aug. 31, 2019
PHP (₱)
Aug. 31, 2019
INR (₨)
Aug. 31, 2019
EUR (€)
Aug. 31, 2019
USD ($)
Gain (Loss) on Discontinuation of Foreign Currency Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net         $ 0 $ 0          
Foreign Currency Forward Contracts, Philippine Peso [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                      
Derivative, Notional Amount           52,000         $ 26,000
Foreign Currency Forward Contracts, Philippine Peso [Member] | Forecast [Member]                      
Percent of Foreign Exchange Contracts Hedged 75.00%                    
Foreign Currency Forward Contracts, Indian Rupee [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                      
Derivative, Notional Amount           50,780         20,410
Foreign Currency Forward Contracts, Indian Rupee [Member] | Forecast [Member]                      
Percent of Foreign Exchange Contracts Hedged 25.00% 50.00%                  
Foreign Currency Forward Contracts, Euro [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                      
Derivative, Notional Amount           26,312         40,854
Foreign Currency Forward Contracts, Euro [Member] | Forecast [Member]                      
Percent of Foreign Exchange Contracts Hedged   25.00% 50.00% 75.00%              
Foreign Currency Forward Contracts, British Pound Sterling [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                      
Derivative, Notional Amount           18,995         26,436
Foreign Currency Forward Contracts, British Pound Sterling [Member] | Forecast [Member]                      
Percent of Foreign Exchange Contracts Hedged 25.00% 50.00%   75.00%              
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                      
Derivative, Notional Amount           $ 148,087 £ 20.5 ₱ 1.4 ₨ 1.4 € 35.7 $ 113,700
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred         $ 3,100