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Equity - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2024 | Feb. 02, 2022 | May 25, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | May 17, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized (in shares) |  |  |  | 5,000,000 | 5,000,000 |  |
Beginning balance - shares outstanding (in shares) |  |  |  | 0 |  |  |
Shares issued on conversion settlement (in shares) |  |  | 1 |  |  |  |
Sale price (in dollars per share) |  |  |  |  |  |  | $ 43.81
Quarterly contract adjustment payments liability |  |  | $ 45,000,000 |  |  |  |
Accretion of purchase contract adjustment liability |  |  |  |  | $ 0 |  |
2024 Purchase Contracts |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Contract redemption obligation |  |  | $ 100,000,000 |  |  |  |
Maximum settlement rate |  |  | 2.2826 |  |  |  |
Number of common stock deliverable percentage |  |  | 85.00% |  |  |  |
Quarterly contract adjustment payments percentage |  |  | 7.125% |  |  |  |
2024 Purchase Contracts | Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Contract redemption obligation | $ 100,000,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase (up to) |  | 8,000,000 |  |  |  |  |
Stock repurchase program period |  | 4 years |  |  |  |  |
Repurchases of common stock - Treasury (in shares) |  |  |  | (900,000) | 0 | (950,000) |
Repurchases of common stock |  |  |  | $ 38,000,000 |  | $ 38,000,000 |
Corporate Units | Preferred stock, without par value |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Units and shares sold (in shares) |  |  | 2,200,000 |  |  |  |
Notional value |  |  | $ 220,000,000 |  |  |  |
Stated value (in dollars per share) |  |  | $ 100 |  |  |  |
Undivided beneficial ownership interest |  |  | 10.00% |  |  |  |
Liquidation preference (in dollars per share) |  |  | $ 1,000 |  |  |  |
Issuance of preferred stock, net of issuance costs |  |  | $ 213,000,000 |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Liquidation preference (in dollars per share) |  |  | $ 1,000 |  |  |  |
Dividend rate |  |  | 0.125% |  |  |  |
Shares issued on conversion (in shares) |  |  | 19.0215 |  |  |  |
Stock conversion price (in dollars per share) |  |  | $ 52.57 |  |  |  |
Convertible Preferred Stock | Preferred stock, without par value |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Units and shares sold (in shares) |  |  | 220,000 |  |  |  |
Series B preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized (in shares) |  |  |  | 220,000 | 220,000 |  |

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