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)

v3.19.1
Stock-Based Compensation - Summary of Stock Options Available for Grant (Detail) - shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]    
Shares Available for Grant, Beginning balance 25,458,910 27,238,814
Granted 1,714,094 1,779,904
Shares Available for Grant, Ending balance 23,744,816 25,458,910