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Capitalization and Short-Term Borrowings - Narrative (Details) |  | 12 Months Ended |  |  |  |  |  |  |
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Feb. 19, 2025 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Jun. 13, 2025 USD ($) | May 31, 2025 lender | Mar. 06, 2025 USD ($) | Jan. 30, 2025 | Apr. 01, 2024 USD ($) | Mar. 08, 2024 USD ($) | Feb. 14, 2024 USD ($) lender
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued for 401(k) plans (in shares) | shares |  | 0 |  |  |  |  |  |  |  |  |
Common stock issued for the Direct Stock Purchase and Dividend Reinvestment Plan (in shares) | shares |  | 0 |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
Stock-based compensation expense |  | $ 17,200,000 | $ 19,800,000 | $ 18,600,000 |  |  |  |  |  |  |
Tax benefit related to stock-based compensation expense |  | 2,200,000 | 2,500,000 | 2,400,000 |  |  |  |  |  |  |
Capitalized stock-based compensation costs |  | 100,000 | 100,000 | 100,000 |  |  |  |  |  |  |
Tax benefit related to stock-based compensation exercises and vestings |  | $ 100,000 |  |  |  |  |  |  |  |  |
Number of shares available for future grant (in shares) | shares |  | 3,711,717 |  |  |  |  |  |  |  |  |
Preferred stock shares authorized (in shares) | shares |  | 10,000,000 |  |  |  |  |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 1 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  | $ 988,729,000 | 299,359,000 | $ 297,306,000 |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2026 |  | 300,000,000 |  |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2027 |  | 600,000,000.0 |  |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2028 |  | 300,000,000.0 |  |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2029 |  | 0 |  |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2030 |  | 500,000,000.0 |  |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing after 2030 |  | 1,000,000,000.0 |  |  |  |  |  |  |  |  |
Commercial paper, outstanding |  | 150,200,000 | 90,700,000 |  |  |  |  |  |  |  |
Short-term notes payable outstanding to banks |  | $ 0 | $ 0 |  |  |  |  |  |  |  |
Committed debt to capitalization ratio |  | 0.65 |  |  |  |  |  |  |  |  |
Ceiling test impairment adjustment (as a percent) |  | 50.00% |  |  |  |  |  |  |  |  |
Ceiling test impairment maximum adjustment |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Cumulative after-tax ceiling test impairments since July 1, 2018 |  | 797,000,000 |  |  |  |  |  |  |  |  |
Committed credit facility debt to capitalization ratio ceiling test impairment adjustment |  | 398,500,000 |  |  |  |  |  |  |  |  |
Debt to capitalization ratio maximum excluded unrealized gains or losses on other derivative financial instruments in AOCI |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Debt to capitalization ratio |  | 0.45 |  |  |  |  |  |  |  |  |
Permitted additional short-term and/or long-term debt to be outstanding under the Credit Agreement |  | $ 3,610,000,000 |  |  |  |  |  |  |  |  |
Aggregated indebtedness |  | 40,000,000.0 |  |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount available to be issued under commercial paper program |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 4.64% | 5.30% |  |  |  |  |  |  |  |
5.20% Notes Due July 2025 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount |  |  |  |  |  |  | $ 450,000,000 |  |  |  |
Long-term debt, interest rate |  |  | 5.20% |  |  |  | 5.20% |  |  |  |
Debt instrument redeemed |  |  |  |  |  |  | $ 450,800,000 |  |  |  |
Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Net proceeds from issuance of long-term debt |  |  | $ 299,400,000 |  |  |  |  |  |  |  |
Debt instruments, number of lenders | lender |  |  |  |  |  |  |  |  |  |  | 6
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Rate adjustment to SOFR |  | 0.0010 |  |  |  |  |  |  |  |  |
Spread on variable rate |  | 1.375% |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of banks in syndicate | lender |  |  |  |  |  | 12 |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Extended term of credit agreement |  |  |  |  |  |  |  | 1 year |  |  |
5.50% Notes Due March 15, 2030 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt | $ 495,200,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate | 5.50% | 5.50% |  |  |  |  |  |  |  |  |
5.50% Notes Due March 15, 2030 | Maximum |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 7.50% |  |  |  |  |  |  |  |  |
5.95% Notes Due March 15, 2035 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt | $ 493,500,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate | 5.95% | 5.95% |  |  |  |  |  |  |  |  |
5.95% Notes Due March 15, 2035 | Maximum |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  | 7.95% |  |  |  |  |  |  |  |  |
5.50% Notes Due January 2026 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Long-term debt, interest rate |  |  |  |  |  |  | 5.50% |  |  |  |
Debt instrument redeemed |  |  |  |  |  |  | $ 503,300,000 |  |  |  |
Indenture From 1974 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument redeemed |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
Carrying amount of long-term debt under 1974 indenture |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
Indenture From 1974 | 7.38% Notes Due June 2025 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  |  |  | 7.38% |  |  |  |  |  |
Board Of Directors |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 27,698 |  |  |  |  |  |  |  |  |
Officer DCP Plan |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 8,691 |  |  |  |  |  |  |  |  |
Stock And Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  | 71,394 |  |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  | 828,720 |  |  |  |  |  |  |  |  |
Share repurchase program, average price per share (in USD per share) | $ / shares |  | $ 64.37 |  |  |  |  |  |  |  |  |
Share repurchases |  | $ 53,800,000 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 128,028 |  |  |  |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 108,799 |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) | shares |  | 239,042 | 361,729 | 202,259 |  |  |  |  |  |  |
Weighted average fair value of award (in dollars per share) | $ / shares |  | $ 55.43 | $ 44.23 | $ 64.28 |  |  |  |  |  |  |
Unrecognized compensation expense |  | $ 11,400,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense recognized weighted average period |  | 2 years 3 months 18 days |  |  |  |  |  |  |  |  |
Performance Shares | 2026 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 174,071 |  |  |  |  |  |  |  |  |
Performance Shares | 2027 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 243,279 |  |  |  |  |  |  |  |  |
Performance Shares | 2028 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 178,825 |  |  |  |  |  |  |  |  |
Performance Shares | 2029 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 0 |  |  |  |  |  |  |  |  |
Performance Shares | 2030 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 11,256 |  |  |  |  |  |  |  |  |
Performance Shares | Thereafter |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 45,044 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) | shares |  | 132,352 | 220,778 | 133,173 |  |  |  |  |  |  |
Weighted average fair value of award (in dollars per share) | $ / shares |  | $ 58.64 | $ 42.44 | $ 58.10 |  |  |  |  |  |  |
Unrecognized compensation expense |  | $ 8,300,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense recognized weighted average period |  | 2 years 4 months 24 days |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2026 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 149,295 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2027 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 126,726 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2028 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 78,002 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2029 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 18,928 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2030 |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 11,258 |  |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | Thereafter |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 45,038 |  |  |  |  |  |  |  |  |
ROC Performance Shares | Three Year Performance Cycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance shares calculation period |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |
ROC Performance Shares | Five Year Performance Cycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance shares calculation period |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |
Emissions Performance Shares | Three Year Performance Cycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance shares calculation period |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |
TSR Performance Shares | Three Year Performance Cycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance shares calculation period |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |
TSR Performance Shares | Five Year Performance Cycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance shares calculation period |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |

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