Note 6 - Derivative Instruments - Hedging Positions and Corresponding Fair Values (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] $ in Thousands, € in Millions, £ in Millions, ₱ in Billions, ₨ in Billions	May 31, 2019 PHP (₱)	May 31, 2019 USD ($)	May 31, 2019 GBP (£)	May 31, 2019 EUR (€)	May 31, 2019 INR (₨)	Aug. 31, 2018 USD ($)
Foreign Currency Forward Contracts, Philippine Peso [Member]
Gross Notional Value		$ 32,000				$ 52,000
Fair Value Asset (Liability)		294				(1,230)
Foreign Currency Forward Contracts, Indian Rupee [Member]
Gross Notional Value		26,830				50,780
Fair Value Asset (Liability)		(1,008)				(1,490)
Foreign Currency Forward Contracts, Euro [Member]
Gross Notional Value		44,748				26,312
Fair Value Asset (Liability)		(431)				(503)
Foreign Currency Forward Contracts, British Pound Sterling [Member]
Gross Notional Value		27,173				18,995
Fair Value Asset (Liability)		(692)				(723)
Foreign Exchange Contract [Member]
Gross Notional Value	₱ 1.7	130,751	£ 20.8	€ 39.3	₨ 1.8	148,087
Fair Value Asset (Liability)		$ (1,837)				$ (3,946)