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	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Forward foreign exchange contracts | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (2,392)	$ 2,858
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1,919)	2,642
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	225
Forward foreign exchange contracts | Cost of revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	2,721	1,644
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3,717	2,717
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	8,996	(1,345)
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)	(511)	(1,864)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(133)	(2,790)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	263	194
Interest rate swap | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (3,950)	$ (3,950)