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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Intangible Assets, Net    
2015 (remaining) $ 14,422us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 27,490us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 25,796us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 24,973us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 23,137us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 123,697us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Finite-Lived Intangible Assets, Net, Total $ 239,515us-gaap_FiniteLivedIntangibleAssetsNet $ 254,772us-gaap_FiniteLivedIntangibleAssetsNet