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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Options    
Outstanding at beginning of period 1,282  
Granted 78  
Exercised (435)  
Cancelled and expired (19)  
Outstanding at end of period 906 1,282
Exercisable at end of period 668  
Options vested and expected to vest at end of period 896  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 46.18  
Granted 381.62  
Exercised 25.36  
Cancelled and expired 145.89  
Outstanding at end of period 83.90 $ 46.18
Exercisable at end of period 39.86  
Options vested and expected to vest at end of period $ 83.73  
Weighted Average Remaining Contractual Term (years)    
Outstanding 5 years 8 months 26 days 5 years 3 months 21 days
Exercisable at end of period 4 years 9 months 10 days  
Options vested and expected to vest at end of period 5 years 8 months 19 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 222,852  
Exercisable at end of period 190,646  
Options vested and expected to vest at end of period $ 220,460