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Capitalization and Short-Term Borrowings - Narrative (Details) |  | 12 Months Ended |  |  |  |  |  |
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May 18, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | May 31, 2024 USD ($) bank | Apr. 01, 2024 USD ($) | Mar. 08, 2024 USD ($) | Feb. 29, 2024 bank | Feb. 14, 2024 USD ($) lender | Feb. 28, 2022 USD ($) bank
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 |  | $ 19,800,000 | $ 18,600,000 | $ 17,600,000 |  |  |  |  |  |
Tax benefit related to stock-based compensation expense |  | 2,500,000 | 2,400,000 | 2,500,000 |  |  |  |  |  |
Capitalized stock-based compensation costs |  | 100,000 | 100,000 | 100,000 |  |  |  |  |  |
Tax benefit related to stock-based compensation exercises and vestings |  | $ 300,000 |  |  |  |  |  |  |  |
Number of shares available for future grant (in shares) | shares |  | 3,889,027 |  |  |  |  |  |  |  |
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 |  | $ 299,359,000 | 297,306,000 | 0 |  |  |  |  |  |
Repayments of short-term borrowings |  | 0 | 250,000,000 | $ 0 |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2025 |  | 500,000,000 |  |  |  |  |  |  |  |
Principal amounts of long-term debt maturing in 2026 |  | 800,000,000.0 |  |  |  |  |  |  |  |
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 after 2029 |  | 500,000,000.0 |  |  |  |  |  |  |  |
Commercial paper, outstanding |  | 90,700,000 | 287,500,000 |  |  |  |  |  |  |
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 |  | 717,900,000 |  |  |  |  |  |  |  |
Committed credit facility debt to capitalization ratio ceiling test impairment adjustment |  | 358,900,000 |  |  |  |  |  |  |  |
Debt to capitalization ratio maximum excluded unrealized gains or losses on other derivative financial instruments in AOCI |  | $ 10,000,000 |  |  |  |  |  |  |  |
Debt to capitalization ratio |  | 0.47 |  |  |  |  |  |  |  |
Permitted additional short-term and/or long-term debt to be outstanding under the Credit Agreement |  | $ 3,070,000,000.00 |  |  |  |  |  |  |  |
Aggregated indebtedness |  | $ 40,000,000.0 |  |  |  |  |  |  |  |
Indenture Test Period |  | 12 months |  |  |  |  |  |  |  |
Indenture period before debt issuance |  | 15 months |  |  |  |  |  |  |  |
Maximum long-term debt to consolidated asset ratio under indenture (as a percent) |  | 60.00% |  |  |  |  |  |  |  |
Stock And Benefit Plans |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  | 78,141 |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  | 1,146,259 |  |  |  |  |  |  |  |
Share repurchase program, average price per share (in USD per share) | $ / shares |  | $ 56.32 |  |  |  |  |  |  |  |
Share Repurchases |  | $ 65,200,000 |  |  |  |  |  |  |  |
364-Day Credit Agreement |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of short-term borrowings |  |  | $ 250,000,000 |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,000,000,000 |  |  |  |  | $ 1,000,000,000
Number of banks in syndicate | bank |  |  |  |  | 3 |  |  | 11 |  | 12
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 |  |  |  |  |  |  |  |
Rate adjustment to SOFR |  | 0.0010 |  |  |  |  |  |  |  |
Spread on variable rate |  | 1.375% |  |  |  |  |  |  |  |
Debt instruments, number of lenders | lender |  |  |  |  |  |  |  |  | 6 |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 300,000,000 |
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 |  | 5.30% | 6.13% |  |  |  |  |  |  |
5.50% Notes Due October 1, 2026 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, face amount | $ 300,000,000 | $ 300,000,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt | $ 297,300,000 |  |  |  |  |  |  |  |  |
Long-term debt, interest rate | 5.50% | 5.50% |  |  |  |  |  |  |  |
Indenture From 1974 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying amount of long-term debt under 1974 indenture |  | $ 50,000,000 |  |  |  |  |  |  |  |
Interest payments Remaining |  | $ 3,200,000 |  |  |  |  |  |  |  |
Board Of Directors |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 36,078 |  |  |  |  |  |  |  |
Officer DCP Plan |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 8,318 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 115,337 |  |  |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 251,255 |  |  |  |  |  |  |  |
Number of shares granted (in shares) | shares |  | 361,729 | 202,259 | 195,397 |  |  |  |  |  |
Weighted average fair value of award (in dollars per share) | $ / shares |  | $ 44.23 | $ 64.28 | $ 65.39 |  |  |  |  |  |
Unrecognized compensation expense |  | $ 15,700,000 |  |  |  |  |  |  |  |
Unrecognized compensation expense recognized weighted average period |  | 2 years 4 months 24 days |  |  |  |  |  |  |  |
Performance Shares | 2025 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 177,118 |  |  |  |  |  |  |  |
Performance Shares | 2026 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 188,767 |  |  |  |  |  |  |  |
Performance Shares | 2027 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 297,392 |  |  |  |  |  |  |  |
Performance Shares | 2028 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 0 |  |  |  |  |  |  |  |
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 | Thereafter |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 56,300 |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) | shares |  | 220,778 | 133,173 | 128,950 |  |  |  |  |  |
Weighted average fair value of award (in dollars per share) | $ / shares |  | $ 42.44 | $ 58.10 | $ 54.10 |  |  |  |  |  |
Unrecognized compensation expense |  | $ 9,200,000 |  |  |  |  |  |  |  |
Unrecognized compensation expense recognized weighted average period |  | 3 years |  |  |  |  |  |  |  |
Non-Performance Based Restricted Stock Units (RSUs) | 2025 |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Long-Term Debt and Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Non-vested stock-based compensation lapse (in shares) | shares |  | 129,688 |  |  |  |  |  |  |  |
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 |  | 111,557 |  |  |  |  |  |  |  |
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 |  | 86,667 |  |  |  |  |  |  |  |
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 |  | 34,757 |  |  |  |  |  |  |  |
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 |  | 19,228 |  |  |  |  |  |  |  |
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 |  | 56,296 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
ESG 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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