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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
ASSETS |  |
Investments in short-term time deposits, Estimated Fair Value | $ 11,542 | $ 13,678
Liabilities: |  |
Long-term debt, Estimated Fair Value | 812,426 | 935,610
Investments in short-term time deposits, Carrying Cost | 11,534 | 13,671
Long-term debt, Carrying Cost | 742,048 | 840,654
Long Term Notes Receivable from Municipalities [Member] |  |
ASSETS |  |
Notes receivable, Estimated Fair Value | 13,416 | 13,413
Liabilities: |  |
Notes receivable, Carrying Cost | 11,138 | 11,846
Long Term Notes Receivable from Sale of Disposal Groups [Member] |  |
ASSETS |  |
Notes receivable, Estimated Fair Value | 6,370 | 6,341
Liabilities: |  |
Notes receivable, Carrying Cost | $ 6,182 | $ 6,061

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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. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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- Definition The fair value portion of restricted investments. + References No definition available. + Details
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