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	Aug. 31, 2019 GBP (£)	Aug. 31, 2019 USD ($)	Aug. 31, 2019 INR (₨)	Aug. 31, 2019 EUR (€)	Aug. 31, 2019 PHP (₱)	Aug. 31, 2018 USD ($)
Foreign Currency Forward Contracts, Philippine Peso [Member]
Gross Notional Value		$ 26,000				$ 52,000
Fair Value Asset (Liability)		520				(1,230)
Foreign Currency Forward Contracts, Indian Rupee [Member]
Gross Notional Value		20,410				50,780
Fair Value Asset (Liability)		(998)				(1,490)
Foreign Currency Forward Contracts, Euro [Member]
Gross Notional Value		40,854				26,312
Fair Value Asset (Liability)		(1,230)				(503)
Foreign Currency Forward Contracts, British Pound Sterling [Member]
Gross Notional Value		26,436				18,995
Fair Value Asset (Liability)		(1,347)				(723)
Foreign Exchange Contract [Member]
Gross Notional Value	£ 20.5	113,700	₨ 1.4	€ 35.7	₱ 1.4	148,087
Fair Value Asset (Liability)		$ (3,055)				$ (3,946)