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Equity Transactions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 06, 2021
May 03, 2021
Mar. 08, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares available for issuance 19,100,000     19,100,000          
Reserve shares counted per share granted from fungible share pool 1.5     1.5          
Remaining shares reserved for issuance 1,993,244     1,993,244          
Stock compensation awards, total liability $ 500     $ 500 $ 100        
Stock compensation awards, current portion $ 300     $ 300 $ 100        
Weighted average grant date fair value of options granted (in dollars per share)       $ 4.81 $ 2.66 $ 2.70      
Intrinsic value of options exercised       $ 15,036 $ 100 $ 300      
Shares repurchased     957,079            
Common stock repurchases     $ 16,100 $ 31,143 3,983        
Remaining repurchase amount         6,100        
Stock repurchase program, authorized amount                 $ 10,000
Stock redeemed or called during period (in shares)   0   82,612          
Subsequent Event                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized to be repurchased             20,000,000    
May 3, 2021 Stock Repurchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares repurchased 634,884                
Common stock repurchases       $ 15,000          
Remaining repurchase amount               $ 15,000  
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       1 year          
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       4 years          
Stock options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options not yet exercisable (in shares) 1,366,877     1,366,877          
Options, service-based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options not yet exercisable (in shares) 853,553     853,553          
Unrecognized compensation cost $ 2,700     $ 2,700          
Weighted average vesting period for unrecognized compensation cost       2 years 9 months 18 days          
Options, service-based | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       1 year          
Stock options, expiration term       5 years          
Options, service-based | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       4 years          
Stock options, expiration term       10 years          
Options, service and performance or market based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options not yet exercisable (in shares) 513,324     513,324          
Restricted stock units and restricted stock awards, service based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Nonvested shares 463,300     463,300          
Restricted stock units and restricted stock awards, service and performance or market based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Nonvested shares 454,081     454,081          
Restricted stock unit, service based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average vesting period for unrecognized compensation cost       2 years 10 months 24 days          
Unrecognized compensation cost, excluding options $ 3,600     $ 3,600          
Restricted stock unit, service based | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       1 year          
Restricted stock unit, service based | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       4 years          
Stock appreciation rights                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Nonvested shares 30,000     30,000          
Cash paid to settle stock appreciation rights       $ 400 $ 600 $ 500      
Stock appreciation rights, weighted-average fair value (in dollars per share) $ 18.86     $ 18.86 $ 0.63        
Stock appreciation rights, service based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average vesting period for unrecognized compensation cost       1 year 3 months 18 days          
Unrecognized compensation cost, excluding options $ 300     $ 300          
Stock options, RSUs and RSAs, performance based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average vesting period for unrecognized compensation cost       3 years          
Unrecognized compensation costs 400     $ 400          
Stock options, RSUs and SARS, market based                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       4 years          
Unrecognized compensation cost $ 900     $ 900          
Weighted average vesting period for unrecognized compensation cost       6 months          
Average share price term       20 days