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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, 2024	Sep. 30, 2023
Long-term debt, net
Carrying value	$ 545,441	$ 545,144
Carrying value
Long-term debt, net
Carrying value	545,400	545,100
Fair value | Level 2
Long-term debt, net
Fair value	$ 461,200	$ 435,500

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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 deduction of 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- References

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