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Common Stock and Stockholders' Equity - Schedule of Stock Option, RSU and PSU Activities (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Number of Shares      
Beginning balance (in shares) 2,718,000    
Stock options granted (in shares) 0    
Stock options exercised (in shares) (848,000)    
Stock options canceled/forfeited (in shares) (207,000)    
Ending balance (in shares) 1,663,000 2,718,000  
Options vested and expected to vest (in shares) 1,662,000    
Options vested and exercisable (in shares) 1,310,000    
Weighted- Average Exercise Price      
Beginning balance (in usd per share) $ 50.55    
Stock options granted (in usd per share) 0    
Stock options exercised (in usd per share) 37.56    
Stock options canceled/forfeited (in usd per share) 70.77    
Ending balance (in usd per share) 54.66 $ 50.55  
Options vested and expected to vest (in usd per share) 54.65    
Options vested and exercisable (in usd per share) $ 50.66    
Weighted-Average Remaining Contractual Term (in years)      
Balance 5 years 7 months 6 days 6 years 2 months 12 days  
Options vested and expected to vest 5 years 7 months 6 days    
Options vested and exercisable 5 years    
Aggregate Intrinsic Value      
Beginning balance $ 48,064    
Stock options exercised 39,003    
Ending balance 31,436 $ 48,064  
Options vested and expected to vest 31,436    
Options vested and exercisable $ 30,233    
Restricted Stock Units (RSUs)      
Number of Shares      
Beginning balance (in shares) 3,293,000    
Granted (in shares) 2,710,000    
Vested (in shares) (1,472,000)    
Canceled/forfeited (in shares) (1,180,000)    
Ending balance (in shares) 3,351,000 3,293,000  
Expected to vest (in shares) 3,173,000    
Weighted- Average Grant Date Fair Value      
Beginning balance (in usd per share) $ 67.76    
Granted (in usd per share) 69.94    
Vested (in usd per share) 67.32    
Canceled/forfeited (in usd per share) 66.83    
Ending balance (in usd per share) 70.04 $ 67.76  
Expected to vest (in usd per share) $ 69.54    
Weighted- Average Remaining Contractual Term (in years)      
Balance 2 years 7 months 6 days 2 years 9 months 18 days  
Aggregate Intrinsic Value      
Beginning balance $ 202,459    
Ending balance 224,096 $ 202,459  
Expected to vest $ 212,235    
Performance Units (PSUs)      
Weighted-Average Remaining Contractual Term (in years)      
Options vested and expected to vest 1 year 9 months 18 days    
Aggregate Intrinsic Value      
Stock options exercised $ 39,000 $ 20,600 $ 23,800
Number of Shares      
Beginning balance (in shares) 112,000    
Granted (in shares) 241,398    
Vested (in shares) (33,000)    
Canceled/forfeited (in shares) 0    
Ending balance (in shares) 320,000 112,000  
Expected to vest (in shares) 305,000    
Weighted- Average Grant Date Fair Value      
Beginning balance (in usd per share) $ 99.05    
Granted (in usd per share) 82.89    
Vested (in usd per share) 99.05    
Ending balance (in usd per share) 86.88 $ 99.05  
Expected to vest (in usd per share) $ 87.00    
Weighted- Average Remaining Contractual Term (in years)      
Balance 1 year 9 months 18 days 2 years  
Aggregate Intrinsic Value      
Beginning balance $ 6,884    
Ending balance 21,430 $ 6,884  
Expected to vest $ 20,370