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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 28, 2015 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Purchase obligations |  |  |  |  |
Purchase orders outstanding for drilling equipment |  |  | $ 56,200 |  |
Fiscal Year |  |  |  |  |
2018 |  |  | 8,015 |  |
2019 |  |  | 5,454 |  |
2020 |  |  | 3,795 |  |
2021 |  |  | 2,944 |  |
2022 |  |  | 2,926 |  |
Thereafter |  |  | 6,825 |  |
Total |  |  | 29,959 |  |
Commitments and Contingencies |  |  |  |  |
Total rent expense |  |  | 14,000 | $ 13,500 | $ 13,600
CONTINGENCIES |  |  |  |  |
Gain contingencies recognized in consolidated financial statements |  |  | $ 0 |  |
Judicial ruling | Keel accident case |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Legal settlement paid |  | $ 72,000 |  |  |
Judicial ruling | Minimum | Keel accident case |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Damages value | $ 100,000 |  |  |  |
Operating lease |  |  |  |  |
LEASES |  |  |  |  |
Area of leased office space (in square feet) | ft² |  |  | 221,021 |  |

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