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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  | $ 500.0
Common Stock Available for Issuance, Value Remaining | $ 394.3 |  | $ 394.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 175,325 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 16.01 |  |
Stock-based compensation expense | $ 0.3 | $ 0.9 | $ 1.6 | $ 1.1 |
Retirement Eligible [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 0.6 | $ 0.5 | $ 0.6 |

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