Note 6 - 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	Feb. 28, 2019 PHP (₱)	Feb. 28, 2019 USD ($)	Feb. 28, 2019 GBP (£)	Feb. 28, 2019 EUR (€)	Feb. 28, 2019 INR (₨)	Aug. 31, 2018 USD ($)
Gross Notional Value	₱ 2.1	$ 111,239	£ 4.9	€ 25.7	₨ 2.5	$ 148,087
Fair Value Asset (Liability)		(1,613)				(3,946)
Philippines, Pesos
Gross Notional Value		39,000				52,000
Fair Value Asset (Liability)		680				(1,230)
India, Rupees
Gross Notional Value		35,580				50,780
Fair Value Asset (Liability)		(1,506)				(1,490)
Euro Member Countries, Euro
Gross Notional Value		29,977				26,312
Fair Value Asset (Liability)		(622)				(503)
United Kingdom, Pounds
Gross Notional Value		6,682				18,995
Fair Value Asset (Liability)		$ (165)				$ (723)