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Common Stock and Stockholders' Equity - Schedule of Stock Option and RSU Award Activities (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Number of Shares    
Beginning balance (in shares) 2,751  
Stock options granted (in shares) 220  
Stock options exercised (in shares) (84)  
Stock options canceled/forfeited (in shares) (26)  
Ending balance (in shares) 2,861 2,751
Weighted- Average Exercise Price    
Beginning balance (in usd per share) $ 35.10  
Stock options granted (in usd per share) 100.25  
Stock options exercised (in usd per share) 26.90  
Stock options canceled/forfeited (in usd per share) 72.89  
Ending balance (in usd per share) $ 40.00 $ 35.10
Weighted- Average Remaining Contractual Term (in years)    
Weighted- Average Remaining Contractual Term (in years) 6 years 3 months 18 days 6 years 3 months 18 days
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value, outstanding $ 176,002  
Stock options exercised 5,969  
Ending aggregate intrinsic value, outstanding $ 141,440 $ 176,002
Number of Shares    
Beginning balance (in shares) 2,419  
RSUs granted (in shares) 279  
RSUs vested (in shares) (205)  
RSUs canceled/forfeited (in shares) (119)  
Ending balance (in shares) 2,374 2,419
Weighted- Average Grant Date Fair Value    
Beginning balance (in usd per share) $ 76.34  
RSUs granted (in usd per share) 99.67  
RSUs vested (in usd per share) 54.11  
RSUs canceled/forfeited (in usd per share) 73.25  
Ending balance (in usd per share) $ 81.16 $ 76.34
Weighted- Average Remaining Contractual Term (in years)    
Weighted- Average Remaining Contractual Term (in years) 2 years 9 months 18 days 3 years
Aggregate Intrinsic Value    
Aggregate intrinsic value, outstanding $ 205,381 $ 238,734