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Earnings Per Share - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 1.2    
Shares of common stock issuable upon conversion 5,200    
Tangible Equity Units      
Earnings Per Share [Line Items]      
Tangible Equity Units outstanding | shares 3.7 3.7  
Debt Instrument, Convertible, Stock Price Trigger, Range Two | TEU Senior Amortizing Notes      
Earnings Per Share [Line Items]      
Debt Instrument, Convertible, Conversion Ratio   1.40746  
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 17.75    
Senior Notes | TEU Senior Amortizing Notes      
Earnings Per Share [Line Items]      
Senior notes $ 1,712 $ 1,712 $ 6,703