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Stock Plans - Employee Stock Purchase Plan (Detail) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 84,833 $ 65,888 $ 80,487
Unrecognized stock-based compensation expense $ 120,658    
Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Purchase price as a percentage of fair market value 85.00%    
Length of offering period (in months) 6 months    
Maximum employee payroll percent deduction of salary 10.00%    
Maximum amount of stock purchasable by employees within a calendar year $ 25    
Number of shares purchased by employees (in shares) 272 273  
Proceeds received $ 9,812 $ 9,670  
Compensation expense 3,417 $ 2,939 $ 3,080
Unrecognized stock-based compensation expense $ 1,139