Impact of Derivatives for Foreign Currency Risk (Interest Rate Risk) and Designated as Hedging Instruments on Accumulated Other Comprehensive Income (Loss) and Earnings (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2013	May 31, 2012
Interest rate swap | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (2,963)	$ (2,963)
Forward foreign exchange contracts | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(865)	3,053
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1,510)	2,117
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	178	(28)
Forward foreign exchange contracts | Cost of revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	4,881	(563)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	4,495	1,677
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	5,753	(1,421)
Forward foreign exchange contracts | Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(152)	(2,238)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	202	(2,925)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 206	$ 152