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Dividends and Share Repurchases (Details) - $ / shares |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 15, 2024 | Jun. 07, 2024 | Apr. 15, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  | $ 0.26 |  | $ 0.26 | $ 0.25 | $ 0.77 | $ 0.74
Stock repurchased (in shares) |  |  |  | 357,303 |  |  |
Average cost per share (in dollars per share) |  |  |  | $ 26.63 |  |  |
Stock repurchase program, number of additional shares authorized |  |  |  | 10,000,000 |  |  |
Remaining shares authorized to be repurchased (in shares) |  |  |  | 11,501,005 |  | 11,501,005 |
Preferred stock dividends declared (in dollars per share) |  |  | $ 12.1875 |  |  |  |
Depository dividends declared (in dollars per share) |  |  | $ 0.30468750 |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 12.1875 |  |  |  |  |  |
Depository dividends declared (in dollars per share) | $ 0.30468750 |  |  |  |  |  |

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