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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Nov. 18, 2021 | Oct. 08, 2021
Class of Stock [Line Items] |  |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  |  | $ 750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance | $ 298.2 |  | $ 298.2 |  | $ 300.0 |
At-the-market Equity Offering Program, Common Stock Issued | 0 |  | 84,547 |  |  |
At-the-market Equity Offering Program, Net Proceeds |  |  | $ 1.7 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 0.1 |  |  |
Common Stock Available for Issuance, Value Remaining | $ 748.2 |  | $ 748.2 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 394,786 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 17.76 |  |  |
Stock-based compensation expense | $ 0.8 | $ 0.8 | $ 2.8 | $ 2.0 |  |
Retirement Eligible |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 1.2 | $ 0.7 |  |

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