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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
Feb. 18, 2021
director
shares
Aug. 31, 2021
shares
Mar. 31, 2021
shares
Feb. 28, 2021
shares
Dec. 31, 2020
shares
Nov. 30, 2020
USD ($)
shares
May 31, 2020
shares
Dec. 31, 2019
USD ($)
Nov. 30, 2019
shares
Jul. 31, 2019
shares
Nov. 30, 2018
shares
Dec. 31, 2017
shares
May 31, 2019
director
shares
Apr. 30, 2017
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
Sep. 30, 2017
May 01, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Share-based compensation costs | $                               $ 3,946,000 $ (5,094,000) $ 9,751,000      
Restricted stock                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Awards granted in period (in shares)                               1,811,708          
Weighted average grant-date fair value per share granted (usd per share) | $ / shares                               $ 4.92 $ 5.73 $ 9.29      
Restricted stock | Non-employee directors                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Awards granted in period (in shares)       127,744 143,145   12,346                            
Award vesting period       1 year                                  
Awards vested in period (in shares) 79,525   63,620                                    
Restricted stock | Employee                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Awards granted in period (in shares)   4,722   1,177,214                                  
Award vesting period           1 year                   3 years 3 years 3 years 3 years 3 years  
Awards vested in period (in shares)         295,723                                
Restricted stock | Employee | Vesting Tranche 1 | Minimum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting rights percentage                               0.00% 0.00%        
Restricted stock | Employee | Vesting Tranche 1 | Maximum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting rights percentage                               150.00% 100.00%        
Restricted stock | Employee | Vesting Tranche 2                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting rights percentage                               150.00% 100.00%        
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          
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 5                       7                
2010 Plan | Restricted stock | Non-employee directors                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Awards granted in period (in shares)                 222,912   59,812   60,088                
2010 Plan | Restricted stock | Employee                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Common stock repurchased and retired (in shares)           458,960                              
Awards granted in period (in shares)           550,224       61,138 971,615 1,308,533   931,260              
Share-based compensation costs | $           $ 2,900,000                              
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)           358,883               463,467              
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                          
Stock repurchase program, period (in years)               3 years                          
Common stock repurchased and retired (in shares)                             943,149 0          
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