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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
3 Months Ended
Mar. 30, 2019
Dec. 30, 2018
Shares    
Outstanding at beginning of period 366,829  
Granted 15,524  
Forfeited 0  
Expired 0  
Exercised (33,983)  
Outstanding at end of period 348,370  
Exercisable at end of period   135,926
Vested and expected to vest at end of period   316,274
Weighted-Average Exercise Price    
Outstanding at beginning of period $ 155.75  
Granted 312.74  
Forfeited 0  
Expired 0  
Exercised 85.78  
Outstanding at end of period $ 169.58  
Exercisable at end of period   $ 127.73
Vested and expected to vest at end of period   $ 166.69
Weighted-Average Remaining Contractual Term    
Outstanding at end of period 5 years 7 months 17 days  
Exercisable at end of period 3 years 5 months 4 days  
Vested and expected to vest at end of period 5 years 5 months 26 days  
Aggregate Intrinsic Value    
Outstanding at end of period $ 43,879  
Exercisable at end of period 22,717  
Vested and expected to vest at end of period $ 40,747