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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 6 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Timing of Revenue Recognition [Roll Forward] |  |
Customers' credit, beginning | $ 44,910 | $ 33,246
Increase (decrease) for customers' credits | (20,032) | (7,725)
Customers' credit, end | 24,878 | 25,521
Billed |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 97,540 | 222,297
Increase (decrease) for customer accounts receivable | 87,529 | (27,844)
Billed, end | 185,069 | 194,453
Unbilled |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 19,100 | 13,769
Increase (decrease) for customer accounts receivable | 55,356 | 32,271
Billed, end | $ 74,456 | $ 46,040

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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 + Details
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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 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 + Details
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