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Dividends and Share Repurchases (Details) - $ / shares |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 15, 2024 | Mar. 08, 2024 | Jan. 15, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  | $ 0.26 |  | $ 0.26 | $ 0.25 | $ 0.51 | $ 0.49
Stock repurchased (in shares) |  |  |  | 7,837 |  |  |
Average cost per share (in dollars per share) |  |  |  | $ 30.38 |  |  |
Remaining shares authorized to be repurchased (in shares) |  |  |  | 1,853,453 |  | 1,853,453 |
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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