Fair Value of Derivative Instruments Located on Condensed Consolidated Balance Sheets Utilized for Foreign Currency Risk Management Purposes (Detail) (Forward foreign exchange contracts, USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Aug. 31, 2012
Designated as Hedging Instruments | Other accrued expense
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	$ 1,922	$ 1,190
Designated as Hedging Instruments | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	2,521	1,335
Not Designated as Hedging Instrument | Other accrued expense
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	3,800	2,976
Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	$ 4,812	$ 4,445