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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, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
Options    
Outstanding at beginning of period | shares 869  
Granted | shares 65  
Exercised | shares (153)  
Cancelled and expired | shares (8)  
Outstanding at end of period | shares 774  
Exercisable at end of period | shares 592  
Options vested and expected to vest at end of period | shares 773  
Weighted Average Exercise Price    
Outstanding at beginning of period | $ / shares $ 112.03  
Granted | $ / shares 221.12  
Exercised | $ / shares 36.41  
Cancelled and expired | $ / shares 227.25  
Outstanding at end of period | $ / shares 134.90  
Exercisable at end of period | $ / shares 98.68  
Options vested and expected to vest at end of period | $ / shares $ 134.92  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 9 months 7 days 5 years 3 months 18 days
Exercisable at end of period 4 years 10 months 2 days  
Options vested and expected to vest at end of period 5 years 9 months 7 days  
Aggregate Intrinsic Value    
Outstanding at end of period | $ $ 117,144  
Exercisable at end of period | $ 110,352  
Options vested and expected to vest at end of period | $ $ 117,040