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Employee Benefit Plans - Deferred Compensation Plans (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] |  |  |
Defined Contribution Plan, Cost | $ 1,600,000 | $ 1,100,000 | $ 1,000,000.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent | 85.00% |  |
Employee Stock Purchase Plan, Maximum Percent of Annual Compensation | 15.00% |  |
Fair Market Value Of Common Stock Available For Purchase To Eligible Employees Maximum | $ 25,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 14,822 | 6,941 | 0
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 300,000 | $ 200,000 |
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ 3,100,000 |  |
Employee Stock |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,500,000 |  |
Share-Based Payment Arrangement |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,100,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 1,100,000 |  |
Supplemental Executive Retirement Plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] |  |  |
Deferred Compensation Liability, Current and Noncurrent | $ 1,900,000 |  |
Deferred Compensation Arrangement with Individual, Compensation Expense | $ 600,000 | $ 100,000 |

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