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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) NOK in Thousands, $ in Thousands | Mar. 31, 2016 USD ($) | Mar. 31, 2016 NOK | Mar. 31, 2015 USD ($) | Mar. 31, 2015 NOK
--- | --- | --- | --- | ---
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding |  | $ 2,052,270 |  | $ 1,534,476 |
Troms Offshore Supply AS | 3.81% January 2014 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [1] | 30,207 | NOK 250,000 | 34,234 | NOK 275,000
Fair value of debt outstanding | [1] | 30,199 |  | 34,226 |
Troms Offshore Supply AS | 5.38% May 2012 notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [1] | 17,500 | NOK 144,840 | 20,152 | 161,880
Fair value of debt outstanding | [1] | $ 17,479 |  | 19,924 |
Troms Offshore Supply AS | Variable rate borrowings, June 2013 borrowing agreement |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [2] |  |  | 3,112 | 25,000
Troms Offshore Supply AS | Variable rate borrowings, May 2012 borrowing agreement |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Long-Term Debt Outstanding | [2] |  |  | $ 2,490 | NOK 20,000
[1] | Note requires semi-annual principal payments.
[2] | Fair values approximate carrying values because the borrowings bear interest at variable rates. The notes were repaid in fiscal 2016.

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