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

Stock-Based Compensation - Summary of Stock Options Available for Grant (Detail)

v3.20.1
Stock-Based Compensation - Summary of Stock Options Available for Grant (Detail) - shares
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]    
Shares Available for Grant, Beginning balance 23,744,816 25,458,910
Granted (800,437) (1,714,094)
Shares Available for Grant, Ending balance 22,944,379 23,744,816