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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Addt. (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) item | Sep. 30, 2014 USD ($) item
PROPERTY, PLANT AND EQUIPMENT |  |  |
Depreciation associated with abandonments | $ 39,300 | $ 43,600 | $ 23,000
Number of idle conventional rigs decommissioned | item |  | 23 | 9
Asset impairment charge | 6,250 | $ 39,242 |
RESTRICTED CASH AND CASH EQUIVALENTS |  |  |
Restricted cash and cash equivalents | 29,600 | 32,000 |
Restricted cash and cash equivalents from initial capitalization of captive company | 2,000 |  |
Additional cash and cash equivalents restricted at the election of management for potential insurance claims | 27,600 |  |
Prepaid expenses and other | 27,631 | 29,998 |
Other assets | 2,000 | 2,000 |
CAPITALIZATION OF INTEREST |  |  |
Capitalized interest | 2,800 | 7,000 | $ 7,700
DRILLING REVENUES |  |  |
Reimbursements received | 125,900 | 302,200 | 326,700
Early termination revenue | 219,000 | 222,300 | 11,700
RENT REVENUES |  |  |
Minimum rents | 9,196 | 9,608 | 9,400
Overage and percentage rents | 1,211 | 1,030 | $ 1,090
Fiscal Year |  |  |
2016 | 7,763 |  |
2017 | 6,076 |  |
2018 | 4,594 |  |
2019 | 4,007 |  |
2020 | 2,379 |  |
Thereafter | 4,642 |  |
Total | 29,461 |  |
Cost and accumulated depreciation for real estate properties |  |  |
Real estate properties | 62,929 | 65,466 |
Accumulated depreciation | (40,777) | (43,326) |
Real estate properties, Net | 22,152 | $ 22,140 |
U.S. Land |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Asset impairment charge | $ 6,300 |  |
Minimum |  |  |
RENT REVENUES |  |  |
Lease term | 3 years |  |
Maximum |  |  |
RENT REVENUES |  |  |
Lease term | 10 years |  |
Contract drilling equipment | Minimum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 4 years |  |
Contract drilling equipment | Maximum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 15 years |  |
Real estate buildings and equipment | Minimum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 10 years |  |
Real estate buildings and equipment | Maximum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 45 years |  |
Land Rigs |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Asset impairment charge | $ 0 |  |
Land Rigs | International Land |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Number of impaired land rigs | item |  | 7 |
Land Rigs | International Land | Assets held for sale |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Number of impaired land rigs | item | 6 |  |
Land Rigs | International Land | Discounted cash flow |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Fair value of land rigs |  | $ 20,600 |
Other assets | Minimum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 2 years |  |
Other assets | Maximum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful lives | 23 years |  |

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