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v3.25.3

Capitalization and Short-Term Borrowings - Summary of Changes in Common Stock Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance (in shares) |  | 91,005,993 |  |
Beginning balance |  | $ 2,848,343 |  |
Net Income Available for Common Stock |  | 518,504 | $ 77,513 | $ 476,866
Dividends Declared on Common Stock |  | (189,919) | (185,220) | (178,095)
Other Comprehensive Income (Loss), Net of Tax |  | $ (43,746) | $ 39,584 | $ 570,673
Ending balance (in shares) |  | 90,379,095 | 91,005,993 |
Ending balance |  | $ 3,094,604 | $ 2,848,343 |
Dividend per share (in dollars per share) |  | $ 2.10 | $ 2.02 | $ 1.94
Stock And Benefit Plans |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share repurchases under repurchase plan (in shares) |  | (71,394) |  |
Share Repurchase Plan |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share repurchases under repurchase plan (in shares) |  | (828,720) |  |
Share Repurchases Under Repurchase Plan |  | $ (53,800) |  |
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance (in shares) |  | 91,006,000 | 91,819,000 | 91,478,000
Beginning balance |  | $ 91,006 | $ 91,819 | $ 91,478
Common stock issued under stock and benefit plans (in shares) |  | 202,000 | 333,000 | 341,000
Common Stock Issued Under Stock and Benefit Plans |  | $ 202 | $ 333 | $ 341
Ending balance (in shares) |  | 90,379,000 | 91,006,000 | 91,819,000
Ending balance |  | $ 90,379 | $ 91,006 | $ 91,819
Common Stock | Share Repurchase Plan |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share repurchases under repurchase plan (in shares) |  | (829,000) | (1,146,000) |
Share Repurchases Under Repurchase Plan |  | $ (829) | $ (1,146) |
Paid In Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | 1,045,487 | 1,040,761 | 1,027,066
Share-Based Payment Expense | [1] | 17,306 | 19,868 | 18,746
Ending balance |  | 1,050,918 | 1,045,487 | 1,040,761
Paid In Capital | Stock And Benefit Plans |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share Repurchases Under Repurchase Plan |  | (2,262) | (1,955) | (5,051)
Paid In Capital | Share Repurchase Plan |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share Repurchases Under Repurchase Plan |  | (9,613) | (13,187) |
Earnings Reinvested in the Business |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | 1,727,326 | 1,885,856 | 1,587,085
Net Income Available for Common Stock |  | 518,504 | 77,513 | 476,866
Dividends Declared on Common Stock |  | (189,919) | (185,220) | (178,095)
Share Repurchases Under Repurchase Plan |  | (43,382) | (50,823) | 0
Ending balance |  | 2,012,529 | 1,727,326 | 1,885,856
Earnings Reinvested in the Business | Share Repurchase Plan |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share Repurchases Under Repurchase Plan |  | (43,382) | (50,823) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | (15,476) | (55,060) | (625,733)
Other Comprehensive Income (Loss), Net of Tax |  | (43,746) | 39,584 | 570,673
Ending balance |  | $ (59,222) | $ (15,476) | $ (55,060)
[1] | Paid in Capital includes compensation costs associated with performance shares and/or restricted stock awards. The expense is included within Net Income Available for Common Stock, net of tax benefits.

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