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Stock Compensation - Additional Disclosures (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Sep. 30, 2018
shares
Jul. 31, 2019
$ / shares
shares
Nov. 30, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Apr. 30, 2017
$ / shares
shares
Dec. 31, 2016
shares
Mar. 31, 2016
shares
Mar. 31, 2015
shares
Feb. 28, 2015
shares
May 31, 2019
employee
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2017
$ / shares
Oct. 01, 2016
$ / shares
May 01, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share price (usd per share) | $ / shares                       $ 10.70     $ 9.50    
2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Additional shares authorized               1,081,200 643,673                
Common Stock Class A Non-Voting | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of shares authorized                                 5,485,649
Increase of shares authorized for grant     400,000 1,100,000   500,000 185,026                    
Non-employee directors | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of new non-employee directors | employee                   7              
Restricted Stock and Phantom Share-Based Awards                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Unamortized fair value of awards | $                       $ 9.1          
Weighted average period over which costs amortized                       2 years          
Restricted stock | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options granted, weighted average grant date fair value (usd per share) | $ / shares       $ 9.75 $ 9.60           $ 9.60            
Share price (usd per share) | $ / shares                               $ 11.06  
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 | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options granted in period (shares)     59,812 84,250 72,500         60,088 72,500            
Options granted, weighted average grant date fair value (usd per share) | $ / shares     $ 9.18             $ 10.64              
Restricted stock | Employee | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options granted in period (shares)   61,138 971,615 1,308,533 931,260           931,260            
Options granted, weighted average grant date fair value (usd per share) | $ / shares   $ 10.04 $ 9.18                            
Vesting Tranche 1 | Restricted stock | Non-employee directors                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Vesting rights percentage                           50.00%      
Vesting Tranche 1 | Restricted stock | Employee | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options granted in period (shares) 190,725                                
Vesting Tranche 2 | Restricted stock | Non-employee directors                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Vesting rights percentage                         50.00%        
Vesting Tranche 2 | Restricted stock | Employee | 2010 Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Options granted in period (shares)       1,117,808