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Share-Based Payments - Performance-Based Awards (Details) - Performance Unit Awards - $ / shares
shares in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Share-Based Payments    
Payout percentage (in percentage) 100.00%  
Performance Unit Awards (in shares)    
Unvested at the beginning of the period (in shares) 349  
Granted (in shares) 230  
Vested (in shares) (23)  
Forfeited (in shares) (99)  
Unvested at the end of the period (in shares) 457 349
Performance Unit Awards (in dollars per share)    
Unvested at the beginning of the period (in dollars per share) $ 20.88  
Granted (in dollars per share) 17.22  
Vested (in dollar per share) 23.45  
Forfeited (in dollars per share) 21.68  
Unvested at the end of the period (in dollars per share) $ 18.74 $ 20.88
Performance Unit Awards (in years)    
Weighted Average Remaining Vesting Term (in Years) 1 year 9 months 18 days 1 year 3 months 18 days