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SEGMENT INFORMATION, GEOGRAPHICAL DATA AND MAJOR CUSTOMERS (Tables) | 12 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, Revenue by Vessel Class | The following table discloses the amount of revenue by segment, and in total for the worldwide fleet, along with the respective percentage of total vessel revenue for the years ended March 31,:
Revenue by vessel class: (In thousands): |  | 2017 |  |  | % of Vessel Revenue |  |  | 2016 |  |  | % of Vessel Revenue |  |  | 2015 |  |  | % of Vessel Revenue |
Americas fleet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater |  | $ | 171,334 |  |  |  | 29 | % |  |  | 235,522 |  |  |  | 25 | % |  |  | 353,232 |  |  |  | 24 | %
Towing-supply |  |  | 56,561 |  |  |  | 10 | % |  |  | 92,768 |  |  |  | 9 | % |  |  | 125,029 |  |  |  | 9 | %
Other |  |  | 11,948 |  |  |  | 2 | % |  |  | 14,705 |  |  |  | 2 | % |  |  | 27,438 |  |  |  | 2 | %
Total |  | $ | 239,843 |  |  |  | 41 | % |  |  | 342,995 |  |  |  | 36 | % |  |  | 505,699 |  |  |  | 35 | %
Asia/Pacific fleet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater |  | $ | 7,252 |  |  |  | 1 | % |  |  | 60,853 |  |  |  | 6 | % |  |  | 94,538 |  |  |  | 6 | %
Towing-supply |  |  | 18,316 |  |  |  | 3 | % |  |  | 28,192 |  |  |  | 3 | % |  |  | 53,281 |  |  |  | 4 | %
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,001 |  |  |  | <1 | %
Total |  | $ | 25,568 |  |  |  | 4 | % |  |  | 89,045 |  |  |  | 9 | % |  |  | 150,820 |  |  |  | 10 | %
Middle East fleet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater |  | $ | 28,274 |  |  |  | 5 | % |  |  | 23,596 |  |  |  | 2 | % |  |  | 28,637 |  |  |  | 2 | %
Towing-supply |  |  | 60,776 |  |  |  | 10 | % |  |  | 87,760 |  |  |  | 10 | % |  |  | 105,642 |  |  |  | 7 | %
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 89,050 |  |  |  | 15 | % |  |  | 111,356 |  |  |  | 12 | % |  |  | 134,279 |  |  |  | 9 | %
Africa/Europe fleet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater |  | $ | 102,374 |  |  |  | 18 | % |  |  | 205,587 |  |  |  | 22 | % |  |  | 382,957 |  |  |  | 26 | %
Towing-supply |  |  | 102,732 |  |  |  | 18 | % |  |  | 153,818 |  |  |  | 16 | % |  |  | 219,914 |  |  |  | 15 | %
Other |  |  | 24,249 |  |  |  | 4 | % |  |  | 52,599 |  |  |  | 5 | % |  |  | 74,689 |  |  |  | 5 | %
Total |  | $ | 229,355 |  |  |  | 40 | % |  |  | 412,004 |  |  |  | 43 | % |  |  | 677,560 |  |  |  | 46 | %
Worldwide fleet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deepwater |  | $ | 309,234 |  |  |  | 53 | % |  |  | 525,558 |  |  |  | 55 | % |  |  | 859,364 |  |  |  | 58 | %
Towing-supply |  |  | 238,385 |  |  |  | 41 | % |  |  | 362,538 |  |  |  | 38 | % |  |  | 503,866 |  |  |  | 35 | %
Other |  |  | 36,197 |  |  |  | 6 | % |  |  | 67,304 |  |  |  | 7 | % |  |  | 105,128 |  |  |  | 7 | %
Total |  | $ | 583,816 |  |  |  | 100 | % |  |  | 955,400 |  |  |  | 100 | % |  |  | 1,468,358 |  |  |  | 100 | %
Entity Wide Major Customer Amount | The following table discloses our customers that accounted for 10% or more of total revenues during the years ended March 31:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Chevron Corporation |  |  | 16.3 | % |  |  | 14.6 | % |  |  | 12.7 | %
Freeport McMoRan (A) |  |  | 11.3 | % |  |  | 3.5 | % |  |  | 1.6 | %
Saudi Aramco |  |  | 10.0 | % |  |  | 7.6 | % |  |  | 5.4 | %
Petroleo Brasileiro SA |  |  | 8.2 | % |  |  | 11.0 | % |  |  | 11.8 | %
BP plc |  |  | 5.8 | % |  |  | 7.1 | % |  |  | 10.1 | %

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