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Summary of Stock Options under Employee Equity Incentive Plan and Stock Option Plan for Non-Employee Directors (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 29, 2019
Shares  
Outstanding at beginning of period 366,829
Granted 31,286
Forfeited 0
Expired 0
Exercised (43,866)
Outstanding at end of period 354,249
Exercisable at end of period 131,684
Vested and expected to vest at end of period 325,498
Weighted-Average Exercise Price  
Outstanding at beginning of period $ 155.75
Granted 313.56
Forfeited 0
Expired 0
Exercised 94.50
Outstanding at end of period 177.28
Exercisable at end of period 134.82
Vested and expected to vest at end of period $ 175.05
Weighted-Average Remaining Contractual Term  
Outstanding at end of period 5 years 7 months 20 days
Exercisable at end of period 3 years 5 months 1 day
Vested and expected to vest at end of period 5 years 6 months 10 days
Aggregate Intrinsic Value  
Outstanding at end of period $ 71,021
Exercisable at end of period 31,991
Vested and expected to vest at end of period $ 65,983