Capital Stock - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Shares	188,469	122,547	101,084
Granted, Shares	44,025	81,995	58,024
Exercised, Shares	(38,009)	(15,113)	(32,751)
Cancelled, Shares	(12,773)	(960)	(3,810)
Ending Balance, Shares	181,712	188,469	122,547
Options Exercisable, Shares	63,432
Option Price per Share, Cancelled		$ 72.55
Options Exercisable, Option Price per Share	$ 62.39
Beginning Balance, Weighted Average Price	66.14	57.74	$ 29.52
Granted, Weighted Average Price	81.84	73.84	78.58
Exercised, Weighted Average Price	58.96	39.38	7.69
Cancelled, Weighted Average Price	75.52	72.55	56.72
Ending Balance, Weighted Average Price	$ 70.78	66.14	57.74
Ending Balance, Weighted Average Remaining Terms (years)	3 years 9 months 18 days
Options Exercisable, Weighted Average Remaining Terms (years)	2 years 3 months 18 days
Ending Balance, Aggregate Intrinsic Value	$ 1,308,808
Options Exercisable, Aggregate Intrinsic Value	$ 897,145
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Option Price per Share	$ 7.74	5.67	5.67
Option price per share, Granted	73.72	68.93	69.02
Option Price per Share, Exercised	7.74	5.67	6.90
Option Price per Share, Cancelled	41.59		41.59
Ending Balance, Option Price per Share	41.59	7.74	5.67
Options Exercisable, Option Price per Share	41.59
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Option Price per Share	82.94	82.59	53.32
Option price per share, Granted	84.93	82.94	82.59
Option Price per Share, Exercised	78.76	78.64	41.59
Option Price per Share, Cancelled	82.94		78.64
Ending Balance, Option Price per Share	84.93	$ 82.94	$ 82.59
Options Exercisable, Option Price per Share	$ 82.94