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Summary of Stock Options under Employee Equity Incentive Plan and Stock Option Plan for Non-Employee Directors (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 28, 2019
USD ($)
$ / shares
shares
Shares  
Outstanding at beginning of period | shares 366,829
Granted | shares 31,286
Exercised | shares (82,437)
Outstanding at end of period | shares 315,678
Exercisable at end of period | shares 93,113
Vested and expected to vest at end of period | shares 286,312
Weighted-Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 155.75
Granted | $ / shares 313.56
Exercised | $ / shares 97.80
Outstanding at end of period | $ / shares 186.53
Exercisable at end of period | $ / shares 148.60
Vested and expected to vest at end of period | $ / shares $ 184.83
Weighted-Average Remaining Contractual Term  
Outstanding at end of period 5 years 9 months
Exercisable at end of period 4 years 29 days
Vested and expected to vest at end of period 5 years 8 months 1 day
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 60,680
Exercisable at end of period | $ 21,430
Vested and expected to vest at end of period | $ $ 55,522