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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]    
Net income (loss) $ (5,445)us-gaap_NetIncomeLoss $ 24,176us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Change in unrealized losses on available -for-sale securities (net of taxes) (2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax  
Foreign currency translation adjustments (2,652)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (97)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Other comprehensive income (loss): (2,654)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (97)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total comprehensive income (loss) $ (8,099)us-gaap_ComprehensiveIncomeNetOfTax $ 24,079us-gaap_ComprehensiveIncomeNetOfTax