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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Supplemental Fair Value Information about Long-Term Fixed-Rate Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021
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Supplemental fair value information about long-term fixed-rate debt |  |  |
Current portion of long-term debt, Carrying value | $ 0 | $ 483,486 |
Long term debt, Carrying value | 542,290 | $ 541,997 |
Carrying value |  |  |
Supplemental fair value information about long-term fixed-rate debt |  |  |
Current portion of long-term debt, Carrying value | 0 |  | $ 483,500
Long term debt, Carrying value | 542,300 |  | 542,000
Fair value | Level 2 |  |  |
Supplemental fair value information about long-term fixed-rate debt |  |  |
Current portion of long term debt, Fair value | 0 |  | 541,600
Long term debt, Fair value | $ 472,800 |  | $ 554,300

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- Definition Long-Term Debt, Current Maturities, Fair Value + References No definition available. + Details
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- Definition Long-Term Debt, Excluding Current Maturities, Fair Value + 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 current. 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 210.5-02.19,20) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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