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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Parenthetical) (Detail) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2015
Mar. 31, 2015
3.81% January 2014 notes    
Debt [Line Items]    
Debt instrument interest rate [1] 3.81% 3.81%
Debt Instrument Maturity Period [1] January 2014  
5.38% May 2012 notes    
Debt [Line Items]    
Debt instrument interest rate [1] 5.38% 5.38%
Debt Instrument Maturity Period [1] May 2012  
Variable rate borrowings, June 2013 borrowing agreement    
Debt [Line Items]    
Debt Instrument Maturity Period [2],[3] June 2013  
Debt instrument interest rate [2],[3] Variable rate  
Gain (loss) on early extinguishment $ 0.1  
Variable rate borrowings, May 2012 borrowing agreement    
Debt [Line Items]    
Debt Instrument Maturity Period [2],[4] May 2012  
Debt instrument interest rate [2],[4] Variable rate  
[1] Notes require semi-annual principal payments.
[2] Fair values approximate carrying values because the borrowings bear interest at variable rates.
[3] Remaining note balance was repaid in September 2015. The company recognized a $0.1 million gain on early extinguishment
[4] Note was repaid in May 2015 upon maturity.