Dividends and Share Repurchases (Details) - $ / shares |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Feb. 27, 2026 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Feb. 28, 2026 |
|
| Stockholders' Equity Note [Abstract] | ||||||
| Dividends on common stock per share (in dollars per share) | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.54 | $ 0.53 | |
| Stock repurchased (in shares) | 2,738,096 | 4,688,109 | ||||
| Average cost per share (in dollars per share) | $ 31.85 | $ 30.98 | ||||
| Share repurchase program, authorized (in shares) | 10,000,000 | |||||
| Remaining shares authorized to be repurchased (in shares) | 7,992,669 | 7,992,669 | ||||
| Preferred stock dividends declared (in dollars per share) | $ 12.1875 | |||||
| Depository dividends declared (in dollars per share) | $ 0.30468750 | |||||