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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
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

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+ References

No definition available.

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- Definition

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+ References

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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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- 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))
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