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Debt - Senior Notes (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Debt Instrument [Line Items]          
Gains on extinguishment of debt $ 50,466 $ 0 $ 58,863 $ 0  
Senior Notes | 6.5% Senior Notes          
Debt Instrument [Line Items]          
Principal amount 490,700   490,700    
Debt Instrument, Unamortized Discount (Premium), Net 3,800   3,800   $ 5,900
Unamortized premium and debt issuance costs 4,700   4,700   $ 7,700
Principal amount repurchased 159,300   159,300    
Repayments of debt 102,500        
Gains on extinguishment of debt 58,863        
Extinguishment of Debt, Gain (Loss), Net of Tax $ 44,100        
Gain of debt retirement per diluted share (in dollars per share) $ 0.68        
Long-term Debt, Fair Value $ 367,000   $ 367,000