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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 14, 2016 USD ($) | Apr. 28, 2015 USD ($) | Sep. 30, 2016 USD ($) ft² | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Purchase obligations |  |  |  |  |
Purchase orders outstanding for drilling equipment |  |  | $ 44,000 |  |
LEASES |  |  |  |  |
Area of leased office space (in square feet) | ft² |  |  | 219,700 |  |
Fiscal Year |  |  |  |  |
2017 |  |  | $ 8,550 |  |
2018 |  |  | 5,680 |  |
2019 |  |  | 5,214 |  |
2020 |  |  | 4,401 |  |
2021 |  |  | 3,049 |  |
Thereafter |  |  | 9,679 |  |
Total |  |  | 36,573 |  |
Rent expense |  |  |  |  |
Total rent expense |  |  | 13,500 | $ 13,600 | $ 12,100
CONTINGENCIES |  |  |  |  |
Gain contingencies recognized in consolidated financial statements |  |  | 0 |  |
Insurance recovery receivable |  |  | 50,200 |  |
Accrued liabilities |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Settlement due |  |  | 72,000 |  |
Judicial ruling | Keel accident case |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Litigation settlement | $ 72,000 |  |  |  |
Minimum | Judicial ruling | Keel accident case |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Damages value |  | $ 100,000 |  |  |
U.S. Land |  |  |  |  |
CONTINGENCIES |  |  |  |  |
Operating cost |  |  | $ 18,800 |  |

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