Amounts Reclassified out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 28, 2016	Nov. 30, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest and foreign exchange	$ 8,901	$ 7,894	$ 5,673	$ 1,724	$ 2,937	$ 3,712	$ 1,417	$ 5,436	$ 24,192	$ 13,502	$ 11,179
Total before tax	(48,879)	(40,578)	(75,847)	(70,936)	(80,608)	(80,417)	(90,976)	(143,049)	(236,240)	(395,050)	(375,713)
Tax benefit	$ 10,114	$ 8,656	$ 24,858	$ 20,386	$ 19,420	$ 22,449	$ 25,734	$ 44,719	64,014	112,322	$ 112,160
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total before tax									4,701	3,696
Tax benefit									(972)	(1,152)
Net of tax									3,729	2,544
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Foreign Exchange Contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenue and Cost of revenue									3,644	2,135
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Interest rate swap contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest and foreign exchange									$ 1,057	$ 1,561