Equity Incentive Plans - Restricted Stock and Performance-Based Restricted Stock Activity Related to Equity Incentive Plans (Detail) - $ / shares		12 Months Ended
		Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Share-based Payment Arrangement [Abstract]
Restricted Stock, Nonvested Shares at beginning of period		146,762	171,070	190,379
Restricted Stock, Nonvested Shares granted		59,801	42,780	67,570
Restricted Stock, Nonvested Shares cancelled		(12,924)	(8,345)	(17,923)
Restricted Stock, Nonvested Shares vested		(48,378)	(58,743)	(68,956)
Restricted Stock, Nonvested Shares at end of period		145,261	146,762	171,070
Weighted Average Grant Date Fair Value at beginning of period	[1]	$ 304.69	$ 251.29	$ 213.57
Weighted Average Grant Date Fair Value, granted	[1]	382.79	398.08	275.06
Weighted Average Grant Date Fair Value, cancelled	[1]	340.94	273.70	230.60
Weighted Average Grant Date Fair Value, vested	[1]	287.41	221.58	175.84
Weighted Average Grant Date Fair Value at end of period	[1]	$ 339.37	$ 304.69	$ 251.29

[1] The weighted average grant date fair value for performance-based restricted stock awards granted in 2020 and 2019 was calculated based on the market price on the grant dates. Certain tranches will ultimately be valued when the performance condition is established for each tranche, which generally occurs in the fourth quarter of each fiscal year.