STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022
STOCK-BASED COMPENSATION
Stock-based compensation, before income taxes	$ 7,844	$ 28,974
Provision for income taxes	(311)	(5,123)
Stock-based compensation, net of income taxes	7,533	23,851
General and administrative
STOCK-BASED COMPENSATION
Stock-based compensation, before income taxes	7,844	5,960
Other operating expense
STOCK-BASED COMPENSATION
Stock-based compensation, before income taxes	$ 0	$ 23,014

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Subparagraph (h)(1)(i)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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