Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 01, 2021 USD ($) $ / shares shares	[1]
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of shares outstanding, Options Balance | shares	662,149
Number of shares outstanding, Options Granted | shares	40,000
Number of shares outstanding, Options forfeited and expired | shares	0
Exercise of stock options (in shares) | shares	(283,755)
Number of shares outstanding, Options Balance | shares	418,394
Number of shares outstanding, Exercisable | shares	263,894
Weighted-average exercise price, Options Balance | $ / shares	$ 26.23
Weighted-average exercise price, Options Granted | $ / shares	79.43
Weighted-average exercise price, Options forfeited and expired | $ / shares	0
Weighted-average exercise price, Options Exercised | $ / shares	17.41
Weighted-average exercise price, Options Balance | $ / shares	37.29
Weighted-average exercise price, Exercisable | $ / shares	$ 29.24
Weighted average remaining contractual term, Balance	6 years 6 months 21 days
Weighted average remaining contractual term, Exercisable	5 years 10 months 20 days
Aggregate intrinsic value, Balance | $	$ 22,066
Aggregate intrinsic value, Exercisable | $	$ 16,042

[1] Does not include restricted stock or employee stock purchase plans.