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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Timing of Revenue Recognition [Roll Forward]
Customers' credit, beginning	$ 38,595	$ 44,910
Increase (decrease) for customers' credits	(14,711)	(16,029)
Customers' credit, end	23,884	28,881
Billed
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	105,531	97,540
Increase (decrease) for customer accounts receivable	67,730	30,724
Billed, end	173,261	128,264
Unbilled
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	20,094	19,100
Increase (decrease) for customer accounts receivable	1,815	1,464
Billed, end	$ 21,909	$ 20,564

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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
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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
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