Equity Incentive Plans - Restricted Stock and Performance-Based Restricted Stock Activity Related to Equity Incentive Plans (Detail) - $ / shares		12 Months Ended
		Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021
Share-Based Payment Arrangement [Abstract]
Restricted Stock, Nonvested Shares at beginning of period		145,261	146,762	171,070
Restricted Stock, Nonvested Shares granted		94,452	59,801	42,780
Restricted Stock, Nonvested Shares forfeited		(18,563)	(12,924)	(8,345)
Restricted Stock, Nonvested Shares vested		(75,506)	(48,378)	(58,743)
Restricted Stock, Nonvested Shares at end of period		145,644	145,261	146,762
Weighted Average Grant Date Fair Value at beginning of period	[1]	$ 339.37	$ 304.69	$ 251.29
Weighted Average Grant Date Fair Value, granted	[1]	389.49	382.79	398.08
Weighted Average Grant Date Fair Value, forfeited	[1]	375.36	340.94	273.70
Weighted Average Grant Date Fair Value, vested	[1]	312.90	287.41	221.58
Weighted Average Grant Date Fair Value at end of period	[1]	$ 381.00	$ 339.37	$ 304.69

[1] The weighted average grant date fair value for performance-based restricted stock awards granted in 2020 was calculated based on the market price on the grant dates.