Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock Options Activity (Detail)

v3.19.1
Stock-Based Compensation - Summary of Stock Options Activity (Detail) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock options granted in period (in shares) 0   0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding Options, Number, Beginning balance (in shares) 0 48,896  
Exercised, Outstanding Options, Number (in shares) 0 (48,896)  
Outstanding Options, Number, Ending balance (in shares) 0 0 48,896
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding Options, Weighted Average Exercise Price, Beginning balance (in dollars per share)   $ 6.38  
Exercised, Outstanding Options, Weighted Average Exercise Price (in dollars per share)   $ 6.38  
Outstanding Options, Weighted Average Exercise Price, Ending balance (in dollars per share)     $ 6.38