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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Related party transactions          
Debt issued $ 2,111,807   $ 2,111,807   $ 2,099,748
Holdings | Holdco Notes          
Related party transactions          
Debt issued 1,000,000   1,000,000    
Carlyle          
Related party transactions          
Expected annual consulting fee     3,000    
Expenses incurred from transactions with related party 750 $ 750 2,250 $ 2,250  
Out of pocket expenditures paid to related party $ 14 $ 24 $ 402 $ 392