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Note 6 - Derivative Instruments (Details Textual)
$ in Thousands, € in Millions, £ in Millions, ₱ in Billions, ₨ in Billions
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 31, 2020
May 31, 2019
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Aug. 31, 2020
Feb. 28, 2019
USD ($)
Feb. 29, 2020
Feb. 28, 2019
PHP (₱)
Feb. 28, 2019
USD ($)
Feb. 28, 2019
GBP (£)
Feb. 28, 2019
EUR (€)
Feb. 28, 2019
INR (₨)
Aug. 31, 2018
USD ($)
Gain (Loss) on Discontinuation of Foreign Currency Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net     $ 0 $ 0                  
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                          
Derivative, Notional Amount               ₱ 2.1 $ 111,239 £ 4.9 € 25.7 ₨ 2.5 $ 148,087
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred           $ 1,500              
Philippines, Pesos | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                          
Derivative, Notional Amount                 39,000       52,000
Philippines, Pesos | Scenario, Forecast [Member]                          
Percent of Foreign Exchange Contracts Hedged 75.00%                        
India, Rupees | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                          
Derivative, Notional Amount                 35,580       50,780
India, Rupees | Scenario, Forecast [Member]                          
Percent of Foreign Exchange Contracts Hedged   75.00%     25.00%   50.00%            
Euro Member Countries, Euro | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                          
Derivative, Notional Amount                 29,977       26,312
Euro Member Countries, Euro | Scenario, Forecast [Member]                          
Percent of Foreign Exchange Contracts Hedged   78.00%                      
United Kingdom, Pounds | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                          
Derivative, Notional Amount                 $ 6,682       $ 18,995
United Kingdom, Pounds | Scenario, Forecast [Member]                          
Percent of Foreign Exchange Contracts Hedged   50.00%