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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | $ 222,297 |
Customers' credit, beginning | 33,246 | $ 32,586
Increase (decrease) for customers' credits | 7,724 | 6,080
Billed, end | 370,965 |
Customers' credit, end | 40,970 | 38,666
Billed |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 222,297 | 212,838
Increase for customer accounts receivable | 148,668 | 53,977
Billed, end | 370,965 | 266,815
Unbilled |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 13,769 | 10,351
Increase for customer accounts receivable | 95,378 | 62,598
Billed, end | $ 109,147 | $ 72,949

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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 https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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