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Capitalization and Short-Term Borrowings - Summary of Changes in Common Stock Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance (in shares) |  | 91,819,405 |  |  |
Beginning balance |  | $ 2,963,376 |  |  |
Net Income Available for Common Stock |  | 77,513 |  | $ 476,866 | $ 566,021
Dividends Declared on Common Stock |  | (185,220) |  | (178,095) | (170,111)
Other Comprehensive Income (Loss), Net of Tax |  | $ 39,584 |  | $ 570,673 | $ (112,136)
Ending balance (in shares) |  | 91,005,993 |  | 91,819,405 |
Ending balance |  | $ 2,848,343 |  | $ 2,963,376 |
Dividend per share (in dollars per share) |  | $ 2.02 |  | $ 1.94 | $ 1.86
Accumulated earnings free from limitations |  | $ 1,600,000 |  |  |
Stock And Benefit Plans |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share repurchases (in shares) |  | (78,141) |  |  |
Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share repurchases (in shares) |  | (1,146,259) |  |  |
Share Repurchases |  | $ (65,200) |  |  |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance (in shares) |  | 91,819,000 |  | 91,478,000 | 91,182,000
Beginning balance |  | $ 91,819 |  | $ 91,478 | $ 91,182
Common stock issued under stock and benefit plans (in shares) |  | 333,000 |  | 341,000 | 296,000
Common stock issued under stock and benefit plans |  | $ 333 |  | $ 341 | $ 296
Ending balance (in shares) |  | 91,006,000 |  | 91,819,000 | 91,478,000
Ending balance |  | $ 91,006 |  | $ 91,819 | $ 91,478
Common Stock | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share repurchases (in shares) |  | (1,146,000) |  |  |
Share Repurchases |  | $ (1,146) |  |  |
Paid In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | 1,040,761 |  | 1,027,066 | 1,017,446
Share-Based Payment Expense | [1] | 19,868 |  | 18,746 | 17,699
Ending balance |  | 1,045,487 |  | 1,040,761 | 1,027,066
Paid In Capital | Stock And Benefit Plans |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  | (1,955) |  | (5,051) | (8,079)
Paid In Capital | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  | (13,187) |  |  |
Earnings Reinvested in the Business |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | 1,885,856 |  | 1,587,085 | 1,191,175
Net Income Available for Common Stock |  | 77,513 |  | 476,866 | 566,021
Dividends Declared on Common Stock |  | (185,220) |  | (178,095) | (170,111)
Share Repurchases |  | (50,823) |  | 0 | 0
Ending balance |  | 1,727,326 | [2] | 1,885,856 | 1,587,085
Earnings Reinvested in the Business | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  | (50,823) |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | (55,060) |  | (625,733) | (513,597)
Other Comprehensive Income (Loss), Net of Tax |  | 39,584 |  | 570,673 | (112,136)
Ending balance |  | $ (15,476) |  | $ (55,060) | $ (625,733)
[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.
[2] | The availability of consolidated earnings reinvested in the business for dividends payable in cash is limited under terms of the indentures covering long-term debt. At September 30, 2024, $1.6 billion of accumulated earnings was free of such limitations.

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