Indebtedness (Tables)

12 Months Ended

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