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Common Stock and Stock Compensation - Additional Disclosures (Details)
1 Months Ended 2 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Nov. 30, 2020
shares
May 31, 2020
$ / shares
shares
Dec. 31, 2019
USD ($)
Nov. 30, 2019
$ / shares
shares
Jul. 31, 2019
$ / shares
shares
Nov. 30, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
May 31, 2019
director
$ / shares
shares
Apr. 30, 2017
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
May 01, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock repurchase program, period (in years)     3 years                        
Share-based compensation costs | $                     $ (5,094,000) $ 9,751,000 $ 10,784,000    
Restricted stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Awards granted in period (in shares)                     1,472,578        
Weighted average grant-date fair value per share granted (usd per share) | $ / shares                     $ 5.73 $ 9.29 $ 9.75    
Restricted stock | Non-employee directors                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Award vesting period                     2 years        
Restricted stock | Non-employee directors | Vesting Tranche 1                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights percentage                           50.00%  
Restricted stock | Non-employee directors | Vesting Tranche 2                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights percentage                         50.00%    
Restricted Stock and Phantom Share-Based Awards                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unamortized fair value of awards | $                   $ 1,200,000 $ 1,200,000        
Weighted average period over which costs amortized                     2 years        
2010 Plan | Non-employee directors                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of new non-employee directors | director               7              
2010 Plan | Restricted stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based payment award, options, grants in period, weighted average grant date fair value (usd per share) | $ / shares             $ 9.75   $ 9.60            
2010 Plan | Restricted stock | Non-employee directors                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Awards granted in period (in shares)   12,346   222,912   59,812 84,250 60,088 72,500            
Weighted average grant-date fair value per share granted (usd per share) | $ / shares   $ 5.24   $ 4.89   $ 9.18   $ 10.64              
2010 Plan | Restricted stock | Employee                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Awards granted in period (in shares)         61,138 971,615 1,308,533   931,260            
Weighted average grant-date fair value per share granted (usd per share) | $ / shares         $ 10.04 $ 9.18                  
Share-based compensation costs | $                     $ (2,900,000)        
2010 Plan | Restricted stock | Employee | Subsequent event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock repurchased and retired (in shares) 458,960                            
2010 Plan | Restricted stock | Employee | Vesting Tranche 1                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock repurchased and retired (in shares)             190,725       81,896        
Common stock repurchased and retired | $                     $ 800,000        
Awards granted in period (in shares)                 463,467            
2010 Plan | Restricted stock | Employee | Vesting Tranche 1 | Subsequent event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock repurchased and retired (in shares) 446,983                            
Common Stock Class A Non-Voting                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock repurchase program, amount authorized | $     $ 60,000,000.0                        
Common stock repurchased and retired (in shares)                   943,149          
Common stock repurchased and retired | $                   $ 5,200,000          
Common Stock Class A Non-Voting | 2010 Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares authorized (in shares)                             5,485,649
Increase of shares authorized for grant (in shares)           400,000 1,100,000