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Dividends and Share Repurchases (Details) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 07, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Stockholders' Equity Note [Abstract] |  |  |  |  |
Cash dividends per share (in dollars per share) | $ 0.27 | $ 0.27 | $ 0.26 | $ 0.53 | $ 0.51
Stock repurchased (in shares) |  | 726,082 |  | 815,610 |
Average cost per share (in dollars per share) |  | $ 29.39 |  | $ 30,350 |
Remaining shares authorized to be repurchased (in shares) |  | 10,777,898 |  | 10,777,898 |
Preferred stock dividends declared (in dollars per share) |  | $ 12.1875 |  |  |
Depository dividends declared (in dollars per share) |  | $ 0.30468750 |  |  |

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