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Indebtedness (Tables) | 12 Months Ended
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Mar. 31, 2016
Summary of Debt Outstanding | The following table summarizes debt outstanding at March 31:
(In thousands) |  | 2016 |  |  | 2015 |
4.61% July 2003 senior notes due fiscal 2016 |  | $ | — |  |  |  | 35,000 |
3.28% September 2010 senior notes due fiscal 2016 |  |  | — |  |  |  | 42,500 |
3.90% September 2010 senior notes due fiscal 2018 |  |  | 44,500 |  |  |  | 44,500 |
3.95% September 2010 senior notes due fiscal 2018 |  |  | 25,000 |  |  |  | 25,000 |
4.12% September 2010 senior notes due fiscal 2019 |  |  | 25,000 |  |  |  | 25,000 |
4.17% September 2010 senior notes due fiscal 2019 |  |  | 25,000 |  |  |  | 25,000 |
4.33% September 2010 senior notes due fiscal 2020 |  |  | 50,000 |  |  |  | 50,000 |
4.51% September 2010 senior notes due fiscal 2021 |  |  | 100,000 |  |  |  | 100,000 |
4.56% September 2010 senior notes due fiscal 2021 |  |  | 65,000 |  |  |  | 65,000 |
4.61% September 2010 senior notes due fiscal 2023 |  |  | 48,000 |  |  |  | 48,000 |
4.06% August 2011 senior notes due fiscal 2019 |  |  | 50,000 |  |  |  | 50,000 |
4.54% August 2011 senior notes due fiscal 2022 |  |  | 65,000 |  |  |  | 65,000 |
4.64% August 2011 senior notes due fiscal 2022 |  |  | 50,000 |  |  |  | 50,000 |
4.26% September 2013 senior notes due fiscal 2021 |  |  | 123,000 |  |  |  | 123,000 |
5.01% September 2013 senior notes due fiscal 2024 |  |  | 250,000 |  |  |  | 250,000 |
5.16% September 2013 senior notes due fiscal 2026 |  |  | 127,000 |  |  |  | 127,000 |
NOK denominated notes due fiscal 2025 |  |  | 17,500 |  |  |  | 20,152 |
NOK denominated notes due fiscal 2026 |  |  | 30,207 |  |  |  | 34,234 |
NOK denominated borrowing agreement due fiscal 2016 |  |  | — |  |  |  | 2,490 |
NOK denominated borrowing agreement due fiscal 2019 |  |  | — |  |  |  | 3,112 |
USD denominated notes due fiscal 2027 |  |  | 27,030 |  |  |  | 29,488 |
USD denominated notes due fiscal 2028 |  |  | 30,033 |  |  |  | — |
Bank term loan due fiscal 2020 |  |  | 300,000 |  |  |  | 300,000 |
Revolving line of credit due fiscal 2020 |  |  | 600,000 |  |  |  | 20,000 |
|  | $ | 2,052,270 |  |  |  | 1,534,476 |
Less: Current maturities of long-term debt |  |  | 2,052,270 |  |  |  | 10,181 |
Total long-term debt |  | $ | — |  |  |  | 1,524,295 |
Troms Offshore Supply AS |
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding | A summary of U.S. dollar denominated Troms Offshore borrowings outstanding at March 31, is as follows:
(In thousands) |  | March 31, 2016 |  |  | March 31, 2015 |
May 2015 notes (A) |  |  |  |  |  |  |  |
Amount outstanding |  | $ | 30,033 |  |  |  | — |
Fair value of debt outstanding (Level 2) |  |  | 30,062 |  |  |  | — |
March 2015 notes (A) |  |  |  |  |  |  |  |
Amount outstanding |  | $ | 27,030 |  |  |  | 29,488 |
Fair value of debt outstanding (Level 2) |  |  | 27,027 |  |  |  | 29,501 |
Summary of Debt Outstanding | A summary of Norwegian Kroner (NOK) denominated Troms Offshore borrowings outstanding at March 31, and their U.S. dollar equivalents is as follows:
(In thousands) |  | March 31, 2016 |  |  | March 31, 2015 |
3.81% January 2014 notes (A): |  |  |  |  |  |  |  |
NOK denominated |  |  | 250,000 |  |  |  | 275,000 |
U.S. dollar equivalent |  | $ | 30,207 |  |  |  | 34,234 |
Fair value in U.S. dollar equivalent (Level 2) |  |  | 30,199 |  |  |  | 34,226 |
5.38% May 2012 notes (A): |  |  |  |  |  |  |  |
NOK denominated |  |  | 144,840 |  |  |  | 161,880 |
U.S. dollar equivalent |  | $ | 17,500 |  |  |  | 20,152 |
Fair value in U.S. dollar equivalent (Level 2) |  |  | 17,479 |  |  |  | 19,924 |
Variable rate borrowings: |  |  |  |  |  |  |  |
June 2013 borrowing agreement (B) |  |  |  |  |  |  |  |
NOK denominated |  |  | — |  |  |  | 25,000 |
U.S. dollar equivalent |  | $ | — |  |  |  | 3,112 |
May 2012 borrowing agreement (B) |  |  |  |  |  |  |  |
NOK denominated |  |  | — |  |  |  | 20,000 |
U.S. dollar equivalent |  | $ | — |  |  |  | 2,490 |
| (A) | Note requires semi-annual principal payments.
| (B) | Fair values approximate carrying values because the borrowings bear interest at variable rates. The notes were repaid in fiscal 2016.
Debt Costs | Interest and debt costs incurred, net of interest capitalized, for the years ended March 31, are as follows:
(In thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Interest and debt costs incurred, net of interest capitalized |  | $ | 53,752 |  |  |  | 50,029 |  |  |  | 43,814 |
Interest costs capitalized |  |  | 10,451 |  |  |  | 13,673 |  |  |  | 11,497 |
Total interest and debt costs |  | $ | 64,203 |  |  |  | 63,702 |  |  |  | 55,311 |
September 2013 Senior Notes |
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding | A summary of these outstanding notes at March 31, is as follows:
(In thousands, except weighted average data) |  | 2016 |  |  | 2015 |
Aggregate debt outstanding |  | $ | 500,000 |  |  |  | 500,000 |
Weighted average remaining life in years |  |  | 7.4 |  |  |  | 8.4 |
Weighted average coupon rate on notes outstanding |  |  | 4.86 | % |  |  | 4.86 | %
Fair value of debt outstanding |  |  | 342,746 |  |  |  | 516,879 |
August 2011 Senior Notes |
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding | A summary of these outstanding notes at March 31, is as follows:
(In thousands, except weighted average data) |  | 2016 |  |  | 2015 |
Aggregate debt outstanding |  | $ | 165,000 |  |  |  | 165,000 |
Weighted average remaining life in years |  |  | 4.6 |  |  |  | 5.6 |
Weighted average coupon rate on notes outstanding |  |  | 4.42 | % |  |  | 4.42 | %
Fair value of debt outstanding |  |  | 127,148 |  |  |  | 167,910 |
September 2010 Senior Notes |
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding | A summary of the aggregate amount of these outstanding notes at March 31, is as follows:
(In thousands, except weighted average data) |  | 2016 |  |  | 2015 |
Aggregate debt outstanding |  | $ | 382,500 |  |  |  | 425,000 |
Weighted average remaining life in years |  |  | 4.1 |  |  |  | 4.6 |
Weighted average coupon rate on notes outstanding |  |  | 4.35 | % |  |  | 4.25 | %
Fair value of debt outstanding |  |  | 302,832 |  |  |  | 431,296 |
July 2003 Senior Notes |
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding | A summary of the aggregate amount of these outstanding notes at March 31, is as follows:
(In thousands, except weighted average data) |  | 2016 |  |  | 2015 |
Aggregate debt outstanding |  | $ | — |  |  |  | 35,000 |
Weighted average remaining life in years |  |  | — |  |  |  | 0.3 |
Weighted average coupon rate on notes outstanding |  |  | — |  |  |  | 4.61 | %
Fair value of debt outstanding |  |  | — |  |  |  | 35,197 |

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