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Stock-based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 2.3 | $ 2.1 |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs related to non-vested stock options award | $ 0.1 |  | $ 0.1
Weighted average period to recognize remaining cost | 11 months 12 days |  |
Performance-Based Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance based restricted stock settled in cash payment (in shares) | 135,337 |  |
Cash settlement of performance-based restricted stock | $ 2.1 |  |
Nonvested Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period to recognize remaining cost | 2 years 1 month 24 days |  |
Unrecognized compensation costs related to non-vested stock awards | $ 16.0 |  | $ 9.0

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