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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Supplemental Fair Value Information about Long-Term Fixed-Rate Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Supplemental fair value information about long-term fixed-rate debt
Current portion of long-term debt	$ 483,486	$ 0
Noncurrent portion of long term debt carrying value	541,997	480,727
Carrying value
Supplemental fair value information about long-term fixed-rate debt
Current portion of long-term debt	483,500	0
Noncurrent portion of long term debt carrying value	542,000	480,700
Fair value | Level 2
Supplemental fair value information about long-term fixed-rate debt
Current portion of long term debt fair value	541,600	0
Noncurrent portion of long term debt fair value	$ 554,300	$ 534,500

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+ References

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- Definition

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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)
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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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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