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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
6 Months Ended 12 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Number of Shares    
Beginning balance (in shares) 7,050  
Stock options granted (in shares) 300  
Stock options exercised (in shares) (1,605)  
Stock options canceled/forfeited (in shares) (254)  
Ending balance (in shares) 5,491 7,050
Weighted-Average Exercise Price    
Beginning balance (in usd per share) $ 13.20  
Stock options granted (in usd per share) 27.11  
Stock options exercised (in usd per share) 6.16  
Stock options canceled/forfeited (in usd per share) 19.32  
Ending balance (in usd per share) $ 15.74 $ 13.20
Weighted-Average Remaining Contractual Term (in years)    
Balance 7 years 10 days 6 years 6 months
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value, outstanding $ 95,326  
Stock options exercised 42,609  
Ending aggregate intrinsic value, outstanding $ 124,016 $ 95,326
Number of Shares    
Beginning balance (in shares) 1,549  
RSUs granted (in shares) 1,095  
RSUs vested (in shares) (283)  
RSUs canceled/forfeited (in shares) (202)  
Ending balance (in shares) 2,159 1,549
Weighted-Average Grant Date Fair Value    
Beginning balance (in usd per share) $ 29.73  
RSUs granted (in usd per share) 27.41  
RSUs vested (in usd per share) 29.23  
RSUs canceled/forfeited (in usd per share) 29.15  
Ending balance (in usd per share) $ 28.67 $ 29.73
Weighted-Average Remaining Contractual Term (in years)    
Balance 3 years 1 month 23 days 3 years 1 month 6 days
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value, outstanding $ 40,387  
Ending aggregate intrinsic value, outstanding $ 82,717 $ 40,387