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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | $ 222,297 |
Customers' credit, beginning | 33,246 | $ 32,586
Increase (decrease) for customers' credits | (2,979) | (10,370)
Billed, end | 110,463 |
Customers' credit, end | 30,267 | 22,216
Billed |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 222,297 | 212,838
Increase (decrease) for customer accounts receivable | (111,834) | 55,205
Billed, end | 110,463 | 268,043
Unbilled |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 13,769 | 10,351
Increase (decrease) for customer accounts receivable | 2,723 | 4,681
Billed, end | $ 16,492 | $ 15,032

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