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ASSET IMPAIRMENTS (Tables) | 9 Months Ended
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Dec. 31, 2017
Asset Impairment Charges [Abstract] |
Summary of Vessels and ROVs Impaired, Amount of Impairment Incurred and Combined Fair Value of Assets after Impairment Charges | The table below summarizes the number of vessels and ROVs impaired, the amount of impairment incurred and the combined fair value of the assets after having recorded the impairment charges.
|  | Successor |  |  |  | Predecessor |
|  | Period from |  |  |  | Period from |  |  |  |  |
|  | August 1, 2017 |  |  |  | April 1, 2017 |  |  |  |  |
|  | through |  |  |  | through |  |  | Year Ended |
(In thousands) |  | December 31, 2017 |  |  |  | July 31, 2017 |  |  | March 31, 2017 |
Number of vessels impaired during the period |  |  | 5 |  |  |  |  | 79 |  |  |  | 132 |
Number of ROVs impaired during the period |  |  | — |  |  |  |  | — |  |  |  | 8 |
Amount of impairment incurred (A) |  | $ | 16,777 |  |  |  |  | 184,748 |  |  |  | 484,727 |
Combined fair value of assets incurring impairment after having recorded impairment charges |  |  | 8,763 |  |  |  |  | 571,821 |  |  |  | 933,068 |
| (A) | The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.

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