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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Options    
Outstanding at beginning of period | shares 853  
Granted | shares 117  
Exercised | shares (65)  
Cancelled and expired | shares (14)  
Outstanding at end of period | shares 891 853
Exercisable at end of period | shares 668  
Options vested and expected to vest at end of period | shares 888  
Weighted Average Exercise Price    
Outstanding at beginning of period | $ / shares $ 87.14  
Granted | $ / shares 259.52  
Exercised | $ / shares 48.67  
Cancelled and expired | $ / shares 235.87  
Outstanding at end of period | $ / shares 110.27 $ 87.14
Exercisable at end of period | $ / shares 62.60  
Options vested and expected to vest at end of period | $ / shares $ 110.28  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 5 months 15 days 5 years 6 months 25 days
Exercisable at end of period 4 years 4 months 20 days  
Options vested and expected to vest at end of period 5 years 5 months 15 days  
Aggregate Intrinsic Value    
Outstanding at end of period | $ $ 79,843  
Exercisable at end of period | $ 77,717  
Options vested and expected to vest at end of period | $ $ 79,672