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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, 2022 | Sep. 30, 2021 | Mar. 31, 2021
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Supplemental fair value information about long-term fixed-rate debt |  |  |
Current portion of long-term debt, net | $ 0 | $ 483,486 |
Noncurrent portion of long term debt carrying value | 541,969 | $ 541,997 |
Carrying value |  |  |
Supplemental fair value information about long-term fixed-rate debt |  |  |
Current portion of long-term debt, net | 0 |  | $ 483,500
Noncurrent portion of long term debt carrying value | 542,000 |  | 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
Noncurrent portion of long term debt fair value | $ 506,900 |  | $ 554,300

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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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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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