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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, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Options    
Outstanding at beginning of period | shares 711  
Granted | shares 62  
Exercised | shares (152)  
Cancelled and expired | shares (9)  
Outstanding at end of period | shares 612 711
Exercisable at end of period | shares 466  
Options vested and expected to vest at end of period | shares 612  
Weighted Average Exercise Price    
Outstanding at beginning of period | $ / shares $ 141.87  
Granted | $ / shares 286.76  
Exercised | $ / shares 55.26  
Cancelled and expired | $ / shares 283.42  
Outstanding at end of period | $ / shares 175.86 $ 141.87
Exercisable at end of period | $ / shares 149.39  
Options vested and expected to vest at end of period | $ / shares $ 175.86  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 10 months 24 days 5 years 5 months 15 days
Exercisable at end of period 4 years 11 months 23 days  
Options vested and expected to vest at end of period 5 years 10 months 24 days  
Aggregate Intrinsic Value    
Outstanding at end of period | $ $ 95,180  
Exercisable at end of period | $ 85,599  
Options vested and expected to vest at end of period | $ $ 95,180