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REVENUE - TIMING OF REVENUE RECOGNITION (Details) $ in Thousands | 9 Months Ended
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Jun. 30, 2021 USD ($)
Timing of Revenue Recognition [Roll Forward] |
Billed, beginning | $ 134,173
Unbilled, beginning | 9,226
Customers' credit, beginning | 25,934
Increase (decrease) for accounts receivable, billed | 71,309
Increase (decrease) for unbilled revenue | 3,437
Increase (decrease) for customers' credits | (3,235)
Billed, end | 205,482
Unbilled, end | 12,663
Customers' credit, end | $ 22,699

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