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Capitalization (Tables) | 6 Months Ended
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Mar. 31, 2025
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, 2025 | 90,613 |  |  | $ | 90,613 |  |  | $ | 1,039,705 |  |  | $ | 1,698,648 |  |  | $ | (76,153) |
Net Income Available for Common Stock |  |  |  |  |  |  | 216,358 |  |  |
Dividends Declared on Common Stock ($0.515 Per Share) |  |  |  |  |  |  | (46,555) |  |  |
Other Comprehensive Loss, Net of Tax |  |  |  |  |  |  |  |  | (146,822) |
Share-Based Payment Expense (1) |  |  |  |  | 5,135 |  |  |  |  |
Common Stock Issued Under Stock and Benefit Plans | 11 |  |  | 11 |  |  | 604 |  |  |  |  |
Share Repurchases Under Repurchase Plan | (226) |  |  | (226) |  |  | (2,622) |  |  | (13,085) |  |  |
Balance at March 31, 2025 | 90,398 |  |  | $ | 90,398 |  |  | $ | 1,042,822 |  |  | $ | 1,855,366 |  |  | $ | (222,975) |
Balance at October 1, 2024 | 91,006 |  |  | $ | 91,006 |  |  | $ | 1,045,487 |  |  | $ | 1,727,326 |  |  | $ | (15,476) |
Net Income Available for Common Stock |  |  |  |  |  |  | 261,344 |  |  |
Dividends Declared on Common Stock ($1.03 Per Share) |  |  |  |  |  |  | (93,226) |  |  |
Other Comprehensive Loss, Net of Tax |  |  |  |  |  |  |  |  | (207,499) |
Share-Based Payment Expense (1) |  |  |  |  | 9,225 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 167 |  |  | 167 |  |  | (2,906) |  |  |  |  |
Share Repurchases Under Repurchase Plan | (775) |  |  | (775) |  |  | (8,984) |  |  | (40,078) |  |  |
Balance at March 31, 2025 | 90,398 |  |  | $ | 90,398 |  |  | $ | 1,042,822 |  |  | $ | 1,855,366 |  |  | $ | (222,975) |
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 |
(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.
Summary of Common Stock Share Activity | Common stock share activity during the six months ended March 31, 2025 consisted of the following items:
| Six Months Ended March 31, 2025
Vesting of Restricted Stock Units | 120,228 |
Vesting of Performance Shares | 89,843 |
Issuance of Common Stock Pursuant to the Company's Non-Employee Director Equity Compensation Plan and Deferred Compensation Plan for Directors and Officers | 20,469 |
Shares Tendered to Pay Withholding Taxes on Stock-Based Compensation Awards (1) | (64,067) |
Common Stock Issued Under Stock and Benefit Plans | 166,473 |
Share Repurchases Under Repurchase Plan | (774,768) |
Total Net Shares Repurchased During the Six Months Ended March 31, 2025 | (608,295) |
(1) The Company considers all shares tendered as cancelled shares restored to the status of authorized but unissued shares, in accordance with New Jersey law.

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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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