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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Supplemental Fair Value Information about Long-Term Fixed-Rate Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Supplemental fair value information about long-term fixed-rate debt |  |
Carrying value of long-term fixed-rate debt | $ 481,647 | $ 480,727
Level 2 |  |
Supplemental fair value information about long-term fixed-rate debt |  |
Fair value of long-term fixed-rate debt | 535,400 | 534,500
Carrying Value |  |
Supplemental fair value information about long-term fixed-rate debt |  |
Carrying value of long-term fixed-rate debt | $ 481,600 | $ 480,700

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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 Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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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