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Capitalization (Tables) | 6 Months Ended
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Mar. 31, 2024
Capitalization, Long-Term Debt and Equity [Abstract] |
Summary of Changes in Common Stock Equity | Summary of Changes in Common Stock Equity
| Common Stock |  | Paid In Capital |  | Earnings Reinvested in the Business |  | Accumulated Other Comprehensive Income (Loss)
Shares |  | Amount |
| (Thousands, except per share amounts)
Balance at January 1, 2024 | 92,116 |  |  | $ | 92,116 |  |  | $ | 1,041,226 |  |  | $ | 1,973,279 |  |  | $ | 67,381 |
Net Income Available for Common Stock |  |  |  |  |  |  | 166,272 |  |  |
Dividends Declared on Common Stock ($0.495 Per Share) |  |  |  |  |  |  | (45,563) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 7,959 |
Share-Based Payment Expense (1) |  |  |  |  | 5,222 |  |  |  |  |
Common Stock Issued Under Stock and Benefit Plans | 12 |  |  | 12 |  |  | 569 |  |  |  |  |
Share Repurchases Under Repurchase Plan | (96) |  |  | (96) |  |  | (1,088) |  |  | (3,816) |  |  |
Balance at March 31, 2024 | 92,032 |  |  | $ | 92,032 |  |  | $ | 1,045,929 |  |  | $ | 2,090,172 |  |  | $ | 75,340 |
Balance at October 1, 2023 | 91,819 |  |  | $ | 91,819 |  |  | $ | 1,040,761 |  |  | $ | 1,885,856 |  |  | $ | (55,060) |
Net Income Available for Common Stock |  |  |  |  |  |  | 299,292 |  |  |
Dividends Declared on Common Stock ($0.99 Per Share) |  |  |  |  |  |  | (91,160) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 130,400 |
Share-Based Payment Expense (1) |  |  |  |  | 9,356 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 309 |  |  | 309 |  |  | (3,100) |  |  |  |  |
Share Repurchases Under Repurchase Plan | (96) |  |  | (96) |  |  | (1,088) |  |  | (3,816) |  |  |
Balance at March 31, 2024 | 92,032 |  |  | $ | 92,032 |  |  | $ | 1,045,929 |  |  | $ | 2,090,172 |  |  | $ | 75,340 |
Balance at January 1, 2023 | 91,787 |  |  | $ | 91,787 |  |  | $ | 1,025,639 |  |  | $ | 1,713,176 |  |  | $ | (293,746) |
Net Income Available for Common Stock |  |  |  |  |  |  | 140,880 |  |  |
Dividends Declared on Common Stock ($0.475 Per Share) |  |  |  |  |  |  | (43,602) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 238,882 |
Share-Based Payment Expense (1) |  |  |  |  | 5,200 |  |  |  |  |
Common Stock Issued Under Stock and Benefit Plans | 8 |  |  | 8 |  |  | 502 |  |  |  |  |
Balance at March 31, 2023 | 91,795 |  |  | $ | 91,795 |  |  | $ | 1,031,341 |  |  | $ | 1,810,454 |  |  | $ | (54,864) |
Balance at October 1, 2022 | 91,478 |  |  | $ | 91,478 |  |  | $ | 1,027,066 |  |  | $ | 1,587,085 |  |  | $ | (625,733) |
Net Income Available for Common Stock |  |  |  |  |  |  | 310,570 |  |  |
Dividends Declared on Common Stock ($0.95 Per Share) |  |  |  |  |  |  | (87,201) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 570,869 |
Share-Based Payment Expense (1) |  |  |  |  | 10,318 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 317 |  |  | 317 |  |  | (6,043) |  |  |  |  |
Balance at March 31, 2023 | 91,795 |  |  | $ | 91,795 |  |  | $ | 1,031,341 |  |  | $ | 1,810,454 |  |  | $ | (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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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 + Details
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