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Commitments and Contingencies (Tables) | 12 Months Ended
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Mar. 31, 2015
Schedule of Vessel Commitments to Acquire and Construct New Vessels and ROVs, by Vessel Type | The table below summarizes the company’s various vessel commitments to acquire and construct new vessels, by vessel type, as of March 31, 2015:
(In thousands, except vessel count) |  | Number of Vessels |  |  | Total Cost |  |  | Invested Through 3/31/15 |  |  | Remaining Balance 3/31/15 |  |  |
Vessels under construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater PSVs (A) |  |  | 17 |  |  | $ | 576,847 |  |  |  | 223,301 |  |  |  | 353,546 |  |  |
Towing supply vessels (A) |  |  | 6 |  |  |  | 105,804 |  |  |  | 79,297 |  |  |  | 26,507 |  |  |
Other |  |  | 1 |  |  |  | 8,014 |  |  |  | 8,014 |  |  |  | — |  |  |
Total vessel commitments |  |  | 24 |  |  | $ | 690,665 |  |  |  | 310,612 |  |  |  | 380,053 |  |  |
(A) | In April 2015, the company cancelled the construction contracts for three towing-supply vessels. There were approximately $13 million of remaining costs to be incurred on these three vessels at the time of termination. In May 2015, the company and the Chinese shipyard that is constructing two 275-foot deepwater PSVs came to an agreement that provides the company an option to take delivery of one or both vessels at any time prior to June 30, 2016 or receive the return of installments aggregating $5.7 million per vessel at the end of this period. There were approximately $41 million of remaining costs to be incurred on these two vessels at the time of the agreement. Refer to Note (19) for a discussion of these vessel construction contract modifications.

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- Definition Tabular disclosure of arrangements in which the entity has agreed to acquire or construct assets. May include identification of assets to be acquired or constructed, pricing, effects on pricing, cancellation rights, and termination provisions. + References No definition available. + Details
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