Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
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| Liabilities: | ||
| Long-term debt, Estimated Fair Value | $ 734,915 | $ 566,582 |
| Long-term debt, Carrying Cost | 750,014 | 580,547 |
| Long Term Notes Receivable from Municipalities [Member] | ||
| ASSETS | ||
| Notes receivable, Estimated Fair Value | 5,186 | 5,444 |
| Liabilities: | ||
| Notes receivable, Carrying Cost | $ 5,105 | $ 5,392 |
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amortized cost, before allowance for credit loss, of financing receivable classified as noncurrent. Excludes net investment in lease. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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