Effect of Derivative Instruments on Statement of Operations (Detail) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2013	May 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in OCI on Derivatives (Effective portion)	$ (1,044)	$ (5,848)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	677	(5,183)
Gain Recognized on Derivative (Ineffective portion and Amount Excluded from Effectiveness Testing)	2,088
Foreign Exchange Forward | Interest and Foreign Exchange
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in income on derivative	(108)	(144)
Foreign Exchange
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in OCI on Derivatives (Effective portion)	(997)	(3,345)
Foreign Exchange | Interest and Foreign Exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized on Derivative (Ineffective portion and Amount Excluded from Effectiveness Testing)	2,088
Foreign Exchange | Sales Revenue, Services, Net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	1,927	(3,917)
Interest Rate Swap Contract
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in OCI on Derivatives (Effective portion)	(47)	(2,503)
Interest Rate Swap Contract | Interest and Foreign Exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (1,250)	$ (1,266)