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REVENUE - TIMING OF REVENUE RECOGNITION (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2019 USD ($)
Timing of Revenue Recognition [Roll Forward] |
Billed, beginning | $ 139,263
Unbilled, beginning | 6,510
Customers' credit, beginning | 27,116
Increase (decrease) for accounts receivable, billed | 111,156
Increase (decrease) for unbilled revenue | 57,146
Increase (decrease) for customers' credits | 2,457
Billed, end | 250,419
Unbilled, end | 63,656
Customers' credit, end | $ 29,573

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