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ASSET IMPAIRMENTS (Tables) | 12 Months Ended
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Mar. 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 during the fiscal years ended March 31, 2017, 2016 and 2015 along with the amount of impairment.
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Number of vessels impaired during the period |  |  | 132 |  |  |  | 58 |  |  |  | 12 |
Number of ROVs impaired during the period |  |  | 8 |  |  |  | — |  |  |  | — |
Amount of impairment incurred |  | $ | 484,727 |  |  |  | 117,311 |  |  |  | 14,525 |
Combined fair value of assets incurring impairment after having recorded impairment charges |  |  | 933,068 |  |  |  | 422,655 |  |  |  | 28,509 |

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