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Common Stock and Stockholders' Equity - Schedule of Stock Option and RSU Award Activities (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Number of Shares    
Beginning balance (in shares) 2,850,000  
Stock options granted (in shares) 640,000  
Stock options exercised (in shares) (287,000)  
Stock options canceled/forfeited (in shares) (138,000)  
Ending balance (in shares) 3,065,000 2,850,000
Weighted- Average Exercise Price    
Beginning balance (in usd per share) | $ / shares $ 44.52  
Stock options granted (in usd per share) | $ / shares 62.50  
Stock options exercised (in usd per share) | $ / shares 9.22  
Stock options canceled/forfeited (in usd per share) | $ / shares 75.29  
Ending balance (in usd per share) | $ / shares $ 50.20 $ 44.52
Weighted- Average Remaining Contractual Term (in years)    
Weighted- Average Remaining Contractual Term (in years) 6 years 9 months 18 days 6 years 4 months 24 days
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value | $ $ 43,576  
Stock options exercised | $ 13,729  
Ending aggregate intrinsic value | $ $ 47,007 $ 43,576
Number of Shares    
Beginning balance (in shares) 3,100,000  
RSUs and PSUs granted (in shares) 2,323,000  
RSUs and PSUs vested (in shares) (705,000)  
RSUs and PSUs canceled/forfeited (in shares) (440,000)  
Ending balance (in shares) 4,278,000 3,100,000
Weighted- Average Grant Date Fair Value    
Beginning balance (in usd per share) | $ / shares $ 74.20  
RSUs and PSUs granted (in usd per share) | $ / shares 63.95  
RSUs and PSUs vested (in usd per share) | $ / shares 72.31  
RSUs and PSUs canceled/forfeited (in usd per share) | $ / shares 73.57  
Ending balance (in usd per share) | $ / shares $ 69.02 $ 74.20
Weighted- Average Remaining Contractual Term (in years)    
Weighted Average Remaining Contractual Terms (in years) 2 years 10 months 24 days 2 years 8 months 12 days
Aggregate Intrinsic Value    
Aggregate intrinsic value, outstanding | $ $ 241,106 $ 143,346
Performance Unit Award    
Number of Shares    
RSUs and PSUs granted (in shares) 111,965,000