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Disclosure of Accounted Total Revenues Percentage (Detail) - Sales Revenue, Net - Customer Concentration Risk | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Chevron Corporation |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage |  | 16.30% | 14.60% | 12.70%
Freeport McMoRan |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage | [1] | 11.30% | 3.50% | 1.60%
Petroleo Brasileiro Sa |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage |  | 8.20% | 11.00% | 11.80%
Saudi Aramco |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage |  | 10.00% | 7.60% | 5.40%
BP Plc |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage |  | 5.80% | 7.10% | 10.10%
[1] | A significant portion of this customer’s fiscal 2017 revenue was the result of the early termination of a long-term vessel charter contract.

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