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Stockholders' Equity - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Stockholders' Equity |  |
Total equity-classified awards |  | $ 1,801
Total stock compensation expense: | $ 2,280 | 2,229
Stock Options and RSUs and RSAs |  |
Stockholders' Equity |  |
Total equity-classified awards | 2,270 | 1,802
Stock options |  |
Stockholders' Equity |  |
Total equity-classified awards | 1,077 | 884
RSUs & RSAs |  |
Stockholders' Equity |  |
Total equity-classified awards | 1,193 | 918
SARs |  |
Stockholders' Equity |  |
Share-based payment arrangement, expense, liability awards | $ 10 | $ 427

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