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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 10,786us-gaap_NetIncomeLoss $ 11,482us-gaap_NetIncomeLoss
Other comprehensive (loss) income:    
Foreign currency translation adjustment (6,296)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 4,599us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total comprehensive income $ 4,490us-gaap_ComprehensiveIncomeNetOfTax $ 16,081us-gaap_ComprehensiveIncomeNetOfTax