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Stock-Based Compensation - Schedule of Nonvested Stock Awards and Performance Shares (Details) - $ / shares
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Performance-based restricted stock      
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  
Shares [Roll Forward]      
Beginning of period (in shares) 778,814 644,785 668,766
Granted (in shares) 260,131 467,819 165,085
Vested (in shares) (242,921) (321,833) 0
Forfeited (in shares) 0 (11,957) (189,066)
End of period (in shares) 796,024 778,814 644,785
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 13.60 $ 16.47 $ 15.72
Granted (in dollars per share) 16.98 9.95 22.40
Vested (in dollars per share) 13.60 15.36 0
Forfeited (in dollars per share) 0 13.44 18.98
End of period (in dollars per share) $ 14.71 $ 13.60 $ 16.47
Time-based restricted stock      
Shares [Roll Forward]      
Beginning of period (in shares) 611,607 431,783 872,181
Granted (in shares) 327,571 448,657 277,165
Vested (in shares) (302,255) (212,558) (690,922)
Forfeited (in shares) (26,793) (56,275) (26,641)
End of period (in shares) 610,130 611,607 431,783
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 12.11 $ 16.60 $ 16.47
Granted (in dollars per share) 15.29 9.82 18.98
Vested (in dollars per share) 11.89 16.41 17.38
Forfeited (in dollars per share) 13.79 12.20 17.02
End of period (in dollars per share) $ 13.85 $ 12.11 $ 16.60
Restricted stock awards expense      
Shares [Roll Forward]      
Beginning of period (in shares) 1,390,421 1,076,568 1,540,947
Granted (in shares) 587,702 916,476 442,250
Vested (in shares) (545,176) (534,391) (690,922)
Forfeited (in shares) (26,793) (68,232) (215,707)
End of period (in shares) 1,406,154 1,390,421 1,076,568
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period (in dollars per share) $ 16.53 $ 16.53 $ 16.15
Granted (in dollars per share) 16.04 9.89 20.26
Vested (in dollars per share) 12.65 15.78 17.38
Forfeited (in dollars per share) 13.79 12.42 18.74
End of period (in dollars per share) $ 14.34 $ 16.53 $ 16.53