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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Options    
Outstanding at beginning of period 853  
Granted 120  
Exercised (85)  
Cancelled and expired (18)  
Outstanding at end of period 869 853
Exercisable at end of period 652  
Options vested and expected to vest at end of period 867  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 87.14  
Granted 257.88  
Exercised 44.02  
Cancelled and expired 224.77  
Outstanding at end of period 112.03 $ 87.14
Exercisable at end of period 64.38  
Options vested and expected to vest at end of period $ 112.03  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 3 months 18 days 5 years 6 months 25 days
Exercisable at end of period 4 years 2 months 23 days  
Options vested and expected to vest at end of period 5 years 3 months 14 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 60,113  
Exercisable at end of period 59,445  
Options vested and expected to vest at end of period $ 60,049