Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
Feb. 13, 2020 |
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| Debt Instrument [Line Items] | |||||||||||
| Total debt | $ 1,425,074 | $ 1,200,000 | |||||||||
| Unamortized debt issuance costs for the senior notes | [1] | (1,759) | (2,566) | ||||||||
| Total debt, net of issuance costs | [2] | 1,423,315 | 1,197,434 | ||||||||
| 4.000% Senior Notes Due 2028 | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior Notes | $ 500,000 | ||||||||||
| Long-term Debt | Revolver Credit Facility | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Payment to credit facility revolver | [3],[4] | 475,000 | 231,250 | ||||||||
| Long-term Debt | Secured Debt | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Payment to credit facility revolver | [3],[4] | 450,074 | 468,750 | ||||||||
| Long-term Debt | 4.000% Senior Notes Due 2028 | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior Notes | $ 500,000 | $ 500,000 | |||||||||
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- Definition Gross Debt No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. No definition available.
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. No definition available.
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