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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Timing of Revenue Recognition [Roll Forward]
Customers' credit, beginning	$ 44,910	$ 33,246
Increase (decrease) for customers' credits	(16,029)	(2,979)
Customers' credit, end	28,881	30,267
Billed
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	97,540	222,297
Increase (decrease) for customer accounts receivable	30,724	(111,834)
Billed, end	128,264	110,463
Unbilled
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	19,100	13,769
Increase (decrease) for customer accounts receivable	1,464	2,723
Billed, end	$ 20,564	$ 16,492

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- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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-Name Accounting Standards Codification
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