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Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016
Revolving Line of Credit |  |  |
Debt [Line Items] |  |  |
Outstanding borrowing | [1],[2] | $ 600,000 | $ 600,000
Fair value revolving line of credit outstanding (Level 2) |  | 390,000 | 600,000
Term loan |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 300,000 | 300,000
Fair value term loan outstanding (Level 2) |  | 195,000 | 300,000
September 2013 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Fair value term loan outstanding (Level 2) |  | 325,000 | 342,746
Aggregate debt outstanding |  | $ 500,000 | $ 500,000
Weighted average remaining life in years | [3] | 6 years 10 months 24 days | 7 years 4 months 24 days
Weighted average coupon rate on notes outstanding |  | 4.86% | 4.86%
August 2011 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Fair value term loan outstanding (Level 2) |  | $ 107,250 | $ 127,148
Aggregate debt outstanding |  | $ 165,000 | $ 165,000
Weighted average remaining life in years | [3] | 4 years 1 month 6 days | 4 years 7 months 6 days
Weighted average coupon rate on notes outstanding |  | 4.42% | 4.42%
September 2010 Senior Unsecured Notes |  |  |
Debt [Line Items] |  |  |
Fair value term loan outstanding (Level 2) |  | $ 248,625 | $ 302,832
Aggregate debt outstanding |  | $ 382,500 | $ 382,500
Weighted average remaining life in years | [3] | 3 years 7 months 6 days | 4 years 1 month 6 days
Weighted average coupon rate on notes outstanding |  | 4.35% | 4.35%
May 2015 4.22% Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [4] | $ 28,727 | $ 30,033
Fair value term loan outstanding (Level 2) | [4] | 27,484 | 30,062
March 2015 4.21% Notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [4] | 25,802 | 27,030
Fair value term loan outstanding (Level 2) | [4] | $ 24,652 | $ 27,027
[1] | The fair value of the term loan and the revolving line of credit approximated their carrying values at March 31, 2016.
[2] | The revolver was fully utilized at September 30, 2016 and March 31, 2016, respectively.
[3] | Weighted average remaining life in years is based on stated maturities; however, all of the company’s indebtedness has been reclassified as current since March 31, 2016.
[4] | Troms Offshore debt requires semi-annual principal payments and has a 12 year maturity.

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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