Shareholders' Equity (Deficit): Additional Information (Details) - Stock options - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Additional disclosures
Total intrinsic value of options exercised	$ 7,700,000	$ 4,800,000	$ 400,000
Total fair value of shares vested	$ 7,300,000	$ 6,900,000	$ 6,200,000
Shares of previously owned common stock surrendered as payment for option shares exercised	2,927	2,973	587
Compensation expense	$ 1,956,600	$ 1,776,600	$ 1,694,800
Total unrecognized compensation expense	$ 4,300,000
Weighted average period for recognition of unrecognized compensation expense	2 years 7 months 6 days