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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Options    
Outstanding at beginning of period 869  
Granted 70  
Exercised (215)  
Cancelled and expired (13)  
Outstanding at end of period 711 869
Exercisable at end of period 537  
Options vested and expected to vest at end of period 711  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 112.03  
Granted 225.60  
Exercised 42.16  
Cancelled and expired 248.42  
Outstanding at end of period 141.87 $ 112.03
Exercisable at end of period 104.55  
Options vested and expected to vest at end of period $ 141.87  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 5 months 16 days 5 years 3 months 19 days
Exercisable at end of period 4 years 6 months 3 days  
Options vested and expected to vest at end of period 5 years 5 months 16 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 129,912  
Exercisable at end of period 117,880  
Options vested and expected to vest at end of period $ 129,912