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REVENUES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 436,100 | $ 436,100 |
Percentage of Revenue Expected to be Recognized in Next Twelve Months | 83.00% |  |
Contract with Customer, Asset, Net | $ 87,000 | 87,000 |
Contract with Customer, Liability | 51,000 | 51,000 |
Contract with Customer, Liability, Revenue Recognized |  | 30,000 |
Contract with Customer, Asset, Net, Current | 100,540 | 100,540 | $ 53,034
Contract with Customer, Liability, Current | $ 55,453 | $ 55,453 | $ 49,035

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