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REVENUE - TIMING OF REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | $ 222,297 |
Customers' credit, beginning | 33,246 | $ 32,586
Increase (decrease) for customers' credits | (7,725) | (12,302)
Billed, end | 194,453 |
Customers' credit, end | 25,521 | 20,284
Billed |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 222,297 | 212,838
Increase (decrease) for customer accounts receivable | (27,844) | 60,475
Billed, end | 194,453 | 273,313
Unbilled |  |
Timing of Revenue Recognition [Roll Forward] |  |
Billed, beginning | 13,769 | 10,351
Increase (decrease) for customer accounts receivable | 32,271 | 45,919
Billed, end | $ 46,040 | $ 56,270

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