Shareholders' Equity (Deficit): Stock Options Activity (Details) - Stock options - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Number of Shares
Outstanding at the beginning of the period (in shares)	355,621	393,488	479,558
Granted (in shares)	62,540	72,600	45,100
Exercised (in shares)	(50,032)	(105,617)	(108,170)
Forfeited (in shares)	(6,501)	(4,850)	(23,000)
Outstanding at the end of the period (in shares)	361,628	355,621	393,488	479,558
Exercisable at the end of the period (in shares)	217,079
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 146.03	$ 113.19	$ 101.78
Granted (in dollars per share)	217.03	226.96	163.87
Exercised (in dollars per share)	94.97	78.78	76.29
Forfeited (in dollars per share)	183.28	158.48	148.16
Outstanding at the end of the period (in dollars per share)	164.70	$ 146.03	$ 113.19	$ 101.78
Exercisable at the end of the period (in dollars per share)	$ 134.28
Weighted Average Remaining Contractual Life (years)
Outstanding	6 years 4 months 24 days	6 years 3 months 25 days	5 years 7 months 9 days	5 years 9 months 14 days
Exercisable at the end of the period	4 years 9 months 18 days
Intrinsic Value
Outstanding at the beginning of the period	$ 39,320,571	$ 27,864,900	$ 45,283,200
Outstanding at the end of the period	26,688,183	$ 39,320,571	$ 27,864,900	$ 45,283,200
Exercisable at the end of the period	$ 22,253,550
Weighted average assumptions and results used in estimation of fair value of options granted
Risk free interest rate (as a percent)	3.15%	1.13%	0.45%
Expected life (years)	6 years	6 years	6 years
Expected volatility (as a percent)	27.58%	25.51%	25.03%
Dividend yield (as a percent)	4.29%	3.13%	2.33%
Option fair value (in dollars per share)	$ 40.59	$ 37.90	$ 28.25