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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 |  |  |  |  |

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