Note 5 - Derivative Instruments - Hedging Positions and Corresponding Fair Values (Details) - Foreign Exchange Contract [Member] - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] $ in Thousands, € in Millions, £ in Millions, ₱ in Billions, ₨ in Billions	Aug. 31, 2018 PHP (₱)	Aug. 31, 2018 USD ($)	Aug. 31, 2018 GBP (£)	Aug. 31, 2018 EUR (€)	Aug. 31, 2018 INR (₨)	Aug. 31, 2017 USD ($)
Gross Notional Value	₱ 2.8	$ 148,087	£ 14	€ 22	₨ 3.6	$ 51,000
Fair Value Asset (Liability)		(3,946)				6,142
Philippines, Pesos
Gross Notional Value		52,000
Fair Value Asset (Liability)		(1,230)
India, Rupees
Gross Notional Value		50,780				51,000
Fair Value Asset (Liability)		(1,490)				6,142
Euro Member Countries, Euro
Gross Notional Value		26,312
Fair Value Asset (Liability)		(503)
United Kingdom, Pounds
Gross Notional Value		18,995
Fair Value Asset (Liability)		$ (723)