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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	$ 212,838	$ 134,173
Unbilled, beginning	10,351	9,226
Customers' credit, beginning	32,586	25,934
Increase (decrease) for accounts receivable, billed	60,475	103,056
Increase (decrease) for unbilled revenue	45,919	32,715
Increase (decrease) for customers' credits	(12,302)	(5,171)
Billed, end	273,313	237,229
Unbilled, end	56,270	41,941
Customers' credit, end	$ 20,284	$ 20,763

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- Definition

Contract with Customer, Increase (Decrease) for Accounts Receivable

+ References

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- Definition

Contract with Customer, Increase (Decrease) for Contract Liability

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- Definition

Contract with Customer, Increase (Decrease) for Unbilled Receivable

+ References

No definition available.

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- Definition

Timing of Revenue Recognition [Roll Forward]

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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-Topic 310
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-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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