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INCOME TAXES, Tax credits (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Tax credits |  |  |  |  |  |  |  |  |  |  |
Operating loss | $ 29,677 | $ 28,028 | $ 65,672 | $ 49,164 | $ 93,001 | $ 13,256 | $ (41,621) | $ (38,670) | $ 172,541 | $ 25,966 | $ (671,963)
Income tax receivable | 78,726 |  |  |  | $ 37,971 |  |  |  | 78,726 | $ 37,971 |
Federal |  |  |  |  |  |  |  |  |  |  |
Tax credits |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | 125,100 |  |
Income tax receivable | 39,800 |  |  |  |  |  |  |  | 39,800 |  |
Federal | MOTIVE Merger |  |  |  |  |  |  |  |  |  |  |
Tax credits |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforwards |  | $ 300 |  |  |  |  |  |  |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |
Tax credits |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforwards | 34,900 |  |  |  |  |  |  |  | 34,900 |  |
Amount of foreign tax credit carryforwards | 30,200 |  |  |  |  |  |  |  | 30,200 |  |
Minimum tax credit carryforwards | $ 600 |  |  |  |  |  |  |  | $ 600 |  |

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