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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail) - Troms Offshore Supply AS | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016
3.81% January 2014 notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 4.31% | 4.31%
Debt Instrument Maturity Period | [1] | January 2014 |
5.38% May 2012 notes |  |  |
Debt [Line Items] |  |  |
Debt instrument interest rate | [1] | 5.88% | 5.88%
Debt Instrument Maturity Period | [1] | May 2012 |
[1] | Note requires semi-annual principal payments.

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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