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Summary of Significant Accounting Policies - Summary of Potential Outstanding Common Stock Equivalents (Detail) - shares
shares in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Accounting Policies [Abstract]      
Stock options, restricted stock units, and shares under the employee stock purchase plan 5,024 4,933 998