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Stock-Based Compensation - Schedule of Nonvested Stock Awards and Performance Shares (Details) - $ / shares
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Performance-based restricted stock      
Shares [Roll Forward]      
Beginning of period (in shares) 644,785 668,766 448,693
Granted (in shares) 467,819 165,085 263,696
Vested (in shares) (321,833) 0 0
Forfeited (in shares) (11,957) (189,066) (43,623)
End of period (in shares) 778,814 644,785 668,766
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 16.47 $ 15.72 $ 16.71
Granted (in dollars per share) 9.95 22.40 13.60
Vested (in dollars per share) 15.36 0.00 0.00
Forfeited (in dollars per share) 13.44 18.98 13.11
End of period (in dollars per share) $ 13.60 $ 16.47 $ 15.72
Time-based restricted stock      
Shares [Roll Forward]      
Beginning of period (in shares) 431,783 872,181 807,124
Granted (in shares) 448,657 277,165 271,855
Vested (in shares) (212,558) (690,922) (189,029)
Forfeited (in shares) (56,275) (26,641) (17,769)
End of period (in shares) 611,607 431,783 872,181
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 16.60 $ 16.47 $ 17.52
Granted (in dollars per share) 9.82 18.98 12.50
Vested (in dollars per share) 16.41 17.38 15.52
Forfeited (in dollars per share) 12.20 17.02 14.08
End of period (in dollars per share) $ 12.11 $ 16.60 $ 16.47
Restricted stock awards expense      
Shares [Roll Forward]      
Beginning of period (in shares) 1,076,568 1,540,947 1,255,817
Granted (in shares) 916,476 442,250 535,551
Vested (in shares) (534,391) (690,922) (189,029)
Forfeited (in shares) (68,232) (215,707) (61,392)
End of period (in shares) 1,390,421 1,076,568 1,540,947
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 16.53 $ 16.15 $ 17.23
Granted (in dollars per share) 9.89 20.26 13.04
Vested (in dollars per share) 15.78 17.38 15.52
Forfeited (in dollars per share) 12.42 18.74 13.39
End of period (in dollars per share) $ 16.53 $ 16.53 $ 16.15
Performance-Based Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted and Vested in Period 86,050