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Share-Based Compensation - Summary of Share Option Granted, Exercise Price, Fair Value, Intrinsic Value (Detail) - $ / shares
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Granted 404,327 605,250 477,149
Exercise Price $ 14.71 $ 8.34 $ 4.21
Ordinary Shares Fair Value Per Share at Grant Date $ 14.71 $ 8.34  
May 20, 2015      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date May 20, 2015    
Number of Options Granted 312,300    
Exercise Price $ 15.17    
Ordinary Shares Fair Value Per Share at Grant Date 15.17    
Per Share Intrinsic Value of Options $ 6.08    
August 5, 2015      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date Aug. 05, 2015    
Number of Options Granted 8,000    
Exercise Price $ 16.70    
Ordinary Shares Fair Value Per Share at Grant Date 16.70    
Per Share Intrinsic Value of Options $ 6.54    
September 2, 2015      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date Sep. 02, 2015    
Number of Options Granted 25,000    
Exercise Price $ 16.34    
Ordinary Shares Fair Value Per Share at Grant Date 16.34    
Per Share Intrinsic Value of Options $ 6.52    
October 31, 2015      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date Oct. 31, 2015    
Number of Options Granted 39,727    
Exercise Price $ 11.62    
Ordinary Shares Fair Value Per Share at Grant Date 11.62    
Per Share Intrinsic Value of Options $ 4.76    
November 4, 2015      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date Nov. 04, 2015    
Number of Options Granted 11,400    
Exercise Price $ 13.00    
Ordinary Shares Fair Value Per Share at Grant Date 13.00    
Per Share Intrinsic Value of Options $ 5.33    
February 9, 2016      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Grant Date Feb. 09, 2016    
Number of Options Granted 7,900    
Exercise Price $ 7.34    
Ordinary Shares Fair Value Per Share at Grant Date 7.34    
Per Share Intrinsic Value of Options $ 3.02