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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Options    
Outstanding at beginning of period | shares 853  
Granted | shares 107  
Exercised | shares (58)  
Cancelled and expired | shares (12)  
Outstanding at end of period | shares 890 853
Exercisable at end of period | shares 667  
Options vested and expected to vest at end of period | shares 886  
Weighted Average Exercise Price    
Outstanding at beginning of period | $ / shares $ 87.14  
Granted | $ / shares 264.56  
Exercised | $ / shares 47.01  
Cancelled and expired | $ / shares 231.53  
Outstanding at end of period | $ / shares 109.03 $ 87.14
Exercisable at end of period | $ / shares 61.69  
Options vested and expected to vest at end of period | $ / shares $ 109.06  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 8 months 4 days 5 years 6 months 25 days
Exercisable at end of period 4 years 7 months 20 days  
Options vested and expected to vest at end of period 5 years 8 months 4 days  
Aggregate Intrinsic Value    
Outstanding at end of period | $ $ 85,789  
Exercisable at end of period | $ 82,730  
Options vested and expected to vest at end of period | $ $ 85,484