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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Options    
Outstanding at beginning of period 1,282  
Granted 72  
Exercised (282)  
Cancelled and expired (4)  
Outstanding at end of period 1,068 1,282
Exercisable at end of period 780  
Options vested and expected to vest at end of period 1,048  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 46.18  
Granted 383.44  
Exercised 20.53  
Cancelled and expired 112.32  
Outstanding at end of period 76.20 $ 46.18
Exercisable at end of period 36.08  
Options vested and expected to vest at end of period $ 76.12  
Weighted Average Remaining Contractual Term (years)    
Outstanding 6 years 7 days 5 years 3 months 21 days
Exercisable at end of period 5 years 10 days  
Options vested and expected to vest at end of period 5 years 11 months 26 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 355,461  
Exercisable at end of period 290,953  
Options vested and expected to vest at end of period $ 348,886