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Capitalization and Short-Term Borrowings (Tables) | 12 Months Ended
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Sep. 30, 2025
Capitalization, Long-Term Debt and Equity [Abstract] |
Schedule 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 September 30, 2022 | 91,478 |  |  | $ | 91,478 |  |  | $ | 1,027,066 |  |  | $ | 1,587,085 |  |  | $ | (625,733) |
Net Income Available for Common Stock |  |  |  |  |  |  | 476,866 |  |  |
Dividends Declared on Common Stock ($1.94 Per Share) |  |  |  |  |  |  | (178,095) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 570,673 |
Share-Based Payment Expense(1) |  |  |  |  | 18,746 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 341 |  |  | 341 |  |  | (5,051) |  |  |  |  |
Balance at September 30, 2023 | 91,819 |  |  | 91,819 |  |  | 1,040,761 |  |  | 1,885,856 |  |  | (55,060) |
Net Income Available for Common Stock |  |  |  |  |  |  | 77,513 |  |  |
Dividends Declared on Common Stock ($2.02 Per Share) |  |  |  |  |  |  | (185,220) |  |  |
Other Comprehensive Income, Net of Tax |  |  |  |  |  |  |  |  | 39,584 |
Share-Based Payment Expense(1) |  |  |  |  | 19,868 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 333 |  |  | 333 |  |  | (1,955) |  |  |  |  |
Share Repurchases Under Repurchase Plan | (1,146) |  |  | (1,146) |  |  | (13,187) |  |  | (50,823) |  |  |
Balance at September 30, 2024 | 91,006 |  |  | 91,006 |  |  | 1,045,487 |  |  | 1,727,326 |  |  | (15,476) |
Net Income Available for Common Stock |  |  |  |  |  |  | 518,504 |  |  |
Dividends Declared on Common Stock ($2.10 Per Share) |  |  |  |  |  |  | (189,919) |  |  |
Other Comprehensive Loss, Net of Tax |  |  |  |  |  |  |  |  | (43,746) |
Share-Based Payment Expense(1) |  |  |  |  | 17,306 |  |  |  |  |
Common Stock Issued (Repurchased) Under Stock and Benefit Plans | 202 |  |  | 202 |  |  | (2,262) |  |  |  |  |
Share Repurchases Under Repurchase Plan | (829) |  |  | (829) |  |  | (9,613) |  |  | (43,382) |  |  |
Balance at September 30, 2025 | 90,379 |  |  | $ | 90,379 |  |  | $ | 1,050,918 |  |  | $ | 2,012,529 |  |  | $ | (59,222) |
(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.
Schedule of Share-Based Compensation for Non-Performance Based Restricted Stock Units | Transactions for 2025 involving nonperformance-based restricted stock units for all plans are summarized as follows:
| Number of Restricted Stock Units |  | Weighted Average Fair Value per Award
Outstanding at September 30, 2024 | 438,193 |  |  | $ | 46.70 |
Granted in 2025 | 132,352 |  |  | $ | 58.64 |
Vested in 2025 | (128,028) |  |  | $ | 49.14 |
Forfeited in 2025 | (13,270) |  |  | $ | 50.78 |
Outstanding at September 30, 2025 | 429,247 |  |  | $ | 49.53 |
Schedule of Share-Based Compensation for Performance Shares | Transactions for 2025 involving performance shares for all plans are summarized as follows:
| Number of Performance Shares |  | Weighted Average Fair Value per Award
Outstanding at September 30, 2024 | 719,577 |  |  | $ | 54.69 |
Granted in 2025 | 239,042 |  |  | $ | 55.43 |
Vested in 2025 | (108,799) |  |  | $ | 56.98 |
Forfeited in 2025 | (206,823) |  |  | $ | 61.05 |
Change in Units Based on Performance Achieved | 9,478 |  |  | $ | 53.47 |
Outstanding at September 30, 2025 | 652,475 |  |  | $ | 52.55 |
Schedule of Weighted Average Assumptions Used in Estimating Fair Value | The following weighted average assumptions were used in estimating the fair value of the TSR Performance Shares at the date of grant:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
Risk-Free Interest Rate | 4.11 | % |  | 4.36 | % |  | 4.03 | %
Remaining Term at Date of Grant (Years) | 2.82 |  | 2.98 |  | 2.80
Expected Volatility | 23.2 | % |  | 23.9 | % |  | 31.6 | %
Expected Dividend Yield (Quarterly) | N/A |  | N/A |  | N/A
Schedule of Long-Term Debt | The outstanding long-term debt is as follows:
| At September 30
| 2025 |  | 2024
| (Thousands)
Medium-Term Notes(1): |  |  |
7.38% due June 2025 | $ | — |  |  | $ | 50,000 |
Notes(1)(2)(3): |  |  |
2.95% to 5.95% due October 2026 to March 2035 | 2,400,000 |  |  | 2,350,000 |
Delayed Draw Term Loan(4): |  |  |
Variable Rate due February 2026 | 300,000 |  |  | 300,000 |
Total Long-Term Debt | 2,700,000 |  |  | 2,700,000 |
Less Unamortized Discount and Debt Issuance Costs | 17,139 |  |  | 11,757 |
Less Current Portion(5) | 300,000 |  |  | 500,000 |
| $ | 2,382,861 |  |  | $ | 2,188,243 |
(1)The Medium-Term Notes and Notes are unsecured. (2)The holders of these notes may require the Company to repurchase their notes at a price equal to 101% of the principal amount in the event of both a change in control and a ratings downgrade to a rating below investment grade. (3)The interest rate payable on $300.0 million of 4.75% notes, $300.0 million of 3.95% notes, $500.0 million of 2.95% notes and $300.0 million of 5.50% notes will be subject to adjustment from time to time, with a maximum of 2.00%, if certain change of control events involving a material subsidiary result in a downgrade of the credit rating assigned to the notes to below investment grade (or if the credit rating assigned to the notes is subsequently upgraded). The interest rate payable on $500.0 million of 5.50% notes and $500.0 million of 5.95% notes will be subject to adjustment from time to time, with a maximum adjustment of 2.00%, such that the coupon will not exceed 7.50% on the 5.50% notes and 7.95% on the 5.95% notes, if certain change in control events involving a material subsidiary result in a downgrade of the credit rating assigned to the notes to a rating below investment grade. A downgrade with a resulting increase to the coupon does not preclude the coupon from returning to its original rate if the Company’s credit rating is subsequently upgraded. (4)The interest rate on the delayed draw term loan, which is based on a weighted average SOFR interest rate, was 5.62% and 6.71% as of September 30, 2025 and September 30, 2024, respectively. The current weighted average locked-in interest rate is 5.43% until mid-December 2025. (5)Current Portion of Long-Term Debt at September 30, 2025 consisted of a $300.0 million long-term delayed draw term loan that matures in February 2026. Current Portion of Long-Term Debt at September 30, 2024 consisted of $50.0 million of 7.38% medium-term notes and $450.0 million of 5.20% notes.

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