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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Related party transactions      
Debt issued $ 2,158,348 $ 2,158,781  
Holdings | Holdco Notes
     
Related party transactions      
Debt issued 1,000,000    
Carlyle
     
Related party transactions      
Expected annual consulting fee 3,000    
Expenses incurred from transactions with related party 3,000    
Out of pocket expenditures paid to related party $ 915 $ 311 $ 0