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Equity - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 02, 2022 | May 25, 2021 | May 31, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2024
Class of Stock [Line Items] |  |  |  |  |  |
Repurchases of common stock |  |  |  |  | $ 0 |
Preferred stock, shares authorized (in shares) |  |  |  | 5,000,000 |  | 5,000,000
Preferred stock, shares outstanding (in shares) |  |  |  | 220,000 |  | 0
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Maximum number of shares authorized for repurchase (up to) (in shares) | 8,000,000 |  |  |  |  |
Stock repurchase program period | 4 years |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | 600,000 | 900,000 |
Repurchases of common stock |  |  |  | $ 22,000,000 | $ 38,000,000 |
Capital 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 |  |  |  |
Capital Units | Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Equity unit received by each holder (in shares) |  |  | 2.2973 |  |  |
Converted equity units (in shares) |  |  | 5,054,030 |  |  |
Convertible Preferred Stock | Preferred stock, without par value |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Units and shares sold (in shares) |  | 220,000 |  |  |  |

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- Definition Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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