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PROPERTY, PLANT AND EQUIPMENT - Impairments (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) item $ / shares | Sep. 30, 2018 USD ($) item | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($)
Impairments |  |  |  |
Property, plant and equipment, net | $ 4,857,382 | $ 4,857,382 | $ 5,144,733 | $ 5,001,051
International FlexRig4 Asset Group |  |  |  |
Impairments |  |  |  |
Property, plant and equipment, net | $ 63,000 | $ 63,000 |  |
Two conventional rigs asset group |  |  |  |
Impairments |  |  |  |
Number of asset groups potentially impaired | item | 2 | 2 |  |
Number of asset groups evaluated | item | 2 | 2 |  |
Impairment charge for asset held for use |  | $ 0 |  |
U.S. Land | Land Rigs |  |  |  |
Impairments |  |  |  |
Impairment charge for assets held for sale |  |  | $ 6,300 |
U.S. Land | Two conventional rigs asset group |  |  |  |
Impairments |  |  |  |
Property, plant and equipment, net | $ 9,000 | $ 9,000 |  |
Percentage the fair values exceed the net book values |  | 64.00% |  |
U.S. Land | Decommissioned rigs |  |  |  |
Impairments |  |  |  |
Impairment charge for assets held for sale | 5,700 |  |  |
Impairment charge for assets held for sale, net of tax | $ 4,200 |  |  |
Diluted earnings per share for impairment charge for assets held for sale (in dollars per share) | $ / shares | $ 0.04 |  |  |
International Land | Two conventional rigs asset group |  |  |  |
Impairments |  |  |  |
Property, plant and equipment, net | $ 15,200 | $ 15,200 |  |
Percentage the fair values exceed the net book values |  | 141.00% |  |
International Land | Six conventional rigs asset group |  |  |  |
Impairments |  |  |  |
Property, plant and equipment, net | 20,800 | $ 20,800 |  |
Impairment charge for asset held for use | $ 1,400 |  |  |
Number of rigs held for sale | item | 6 | 6 |  |
Net book value of certain rig components transferred | $ 8,500 | $ 8,500 |  |
Impairment charge for assets held for sale | 9,200 |  |  |
Impairment charge for assets held for sale, net of tax | $ 7,000 |  |  |
Diluted earnings per share for impairment charge for assets held for sale (in dollars per share) | $ / shares | $ 0.06 |  |  |
Impairment charge for asset held for use, net of tax | $ 1,000 |  |  |
Diluted earnings per share for impairment charge for assets held for use (in dollars per share) | $ / shares | $ 0.01 |  |  |

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