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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning balance | $ 212,838 |
Customers' credit, beginning balance | 32,586 | $ 25,934
Increase for customers' credits balances and deposits | 660 | 6,652
Billed, ending balance | 222,297 | 212,838
Customers' credit, ending balance | 33,246 | 32,586
Billed |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning balance | 212,838 | 134,173
Increase for customer accounts receivable | 9,459 | 78,665
Billed, ending balance | 222,297 | 212,838
Unbilled |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning balance | 10,351 | 9,226
Increase for customer accounts receivable | 3,418 | 1,125
Billed, ending balance | $ 13,769 | $ 10,351

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