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Capitalization and Short-Term Borrowings (Summary of Changes in Common Stock Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
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 |  | $ 166,272 | $ 140,880 | 299,292 | $ 310,570
Dividends Declared on Common Stock |  | (45,563) | (43,602) | (91,160) | (87,201)
Other Comprehensive Income, Net of Tax |  | $ 7,959 | $ 238,882 | $ 130,400 | $ 570,869
Ending balance (in shares) |  | 92,031,724 |  | 92,031,724 |
Ending balance |  | $ 3,303,473 |  | $ 3,303,473 |
Dividends per share (in dollars per share) |  | $ 0.495 | $ 0.475 | $ 0.99 | $ 0.95
Stock and Benefit Plans |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases (in shares) |  |  |  | (77,426) |
Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases (in shares) |  | (96,133) |  |  |
Share Repurchases |  | $ (5,000) |  |  |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance (in shares) |  | 92,116,000 | 91,787,000 | 91,819,000 | 91,478,000
Beginning balance |  | $ 92,116 | $ 91,787 | $ 91,819 | $ 91,478
Common stock issued under stock and benefit plans (in shares) |  | 12,000 | 8,000 | 309,000 | 317,000
Common Stock Issued Under Stock and Benefit Plans |  | $ 12 | $ 8 | $ 309 | $ 317
Ending balance (in shares) |  | 92,032,000 | 91,795,000 | 92,032,000 | 91,795,000
Ending balance |  | $ 92,032 | $ 91,795 | $ 92,032 | $ 91,795
Common Stock | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases (in shares) |  | (96,000) |  | (96,000) |
Share Repurchases |  | $ (96) |  | $ (96) |
Paid In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | 1,041,226 | 1,025,639 | 1,040,761 | 1,027,066
Share-Based Payment Expense | [1] | 5,222 | 5,200 | 9,356 | 10,318
Common Stock Issued Under Stock and Benefit Plans |  | 569 | 502 |  |
Ending balance |  | 1,045,929 | 1,031,341 | 1,045,929 | 1,031,341
Paid In Capital | Stock and Benefit Plans |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  |  |  | (3,100) | (6,043)
Paid In Capital | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  | (1,088) |  | (1,088) |
Earnings Reinvested in the Business |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | 1,973,279 | 1,713,176 | 1,885,856 | 1,587,085
Net Income Available for Common Stock |  | 166,272 | 140,880 | 299,292 | 310,570
Dividends Declared on Common Stock |  | (45,563) | (43,602) | (91,160) | (87,201)
Share Repurchases |  | (3,816) | 0 | (3,816) | 0
Ending balance |  | 2,090,172 | 1,810,454 | 2,090,172 | 1,810,454
Earnings Reinvested in the Business | Share Repurchase Plan |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Share Repurchases |  | (3,816) |  | (3,816) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  | 67,381 | (293,746) | (55,060) | (625,733)
Other Comprehensive Income, Net of Tax |  | 7,959 | 238,882 | 130,400 | 570,869
Ending balance |  | $ 75,340 | $ (54,864) | $ 75,340 | $ (54,864)
[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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