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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.