Shareholders' Equity (Deficit): Stock Option Plans and Stock-Based Compensation (Details) - Stock options - USD ($)		6 Months Ended		12 Months Ended
	Apr. 26, 2017	Jul. 01, 2017	Jun. 25, 2016	Dec. 31, 2016	Apr. 25, 2017	Feb. 20, 2011
Number of Shares
Outstanding at the beginning of the period (in shares)		673,670
Granted (in shares)		36,000
Exercised (in shares)		(52,686)
Forfeited (in shares)		(4,750)
Outstanding at the end of the period (in shares)		652,234		673,670
Exercisable at the end of the period (in shares)		462,953
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 62.11
Granted (in dollars per share)		122.19
Exercised (in dollars per share)		29.75
Forfeited (in dollars per share)		95.28
Outstanding at the end of the period (in dollars per share)		67.80		$ 62.11
Exercisable at the end of the period (in dollars per share)		$ 54.26
Weighted Average Remaining Contractual Life (years)
Outstanding		6 years 18 days		6 years 1 month 10 days
Exercisable at the end of the period		5 years 15 days
Intrinsic Value
Outstanding		$ 39,882,600		$ 43,139,100
Exercisable at the end of the period		$ 34,577,700
Weighted average assumptions and results used in estimation of fair value of options granted
Risk free interest rate (as a percent)		1.90%	1.52%
Expected life (years)		6 years	6 years
Expected volatility (as a percent)		26.93%	27.10%
Dividend yield (as a percent)		1.14%	1.38%
Option fair value (in dollars per share)		$ 31.38	$ 23.78
Additional disclosures
Compensation expense		$ 966,600	$ 882,200
Total unrecognized compensation expense		$ 4,300,000
Weighted average period for recognition of unrecognized compensation expense		2 years 6 months
2001 Plan and 2010 Plan
Additional disclosures
Shares of previously owned common stock surrendered as payment for option shares exercised		2,927
2001 Plan
Stock Option Plans
Number of shares authorized for issuance						750,000
2010 Plan
Stock Option Plans
Increase in number of shares authorized for issuance	200,000
Number of shares authorized for issuance	700,000				500,000
Nonemployee Directors Plan
Stock Option Plans
Number of shares authorized for issuance		350,000