Shareholders' Equity (Deficit): Stock Option Plans and Stock-Based Compensation (Details) - Stock options - USD ($)	3 Months Ended		12 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Dec. 26, 2015
Number of Shares
Outstanding at the beginning of the period (in shares)	668,740
Exercised (in shares)	(2,187)
Outstanding at the end of the period (in shares)	666,553		668,740
Exercisable at the end of the period (in shares)	438,390
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 53.73
Exercised (in dollars per share)	68.69
Outstanding at the end of the period (in dollars per share)	53.68		$ 53.73
Exercisable at the end of the period (in dollars per share)	$ 41.63
Weighted Average Remaining Contractual Life (years)
Outstanding	6 years 1 month 24 days		6 years 4 months 28 days
Exercisable at the end of the period	5 years 11 days
Intrinsic Value
Outstanding	$ 29,704,000		$ 25,582,300
Exercisable at the end of the period	$ 24,817,100
Additional disclosures
Granted (in shares)	0	0
Compensation expense	$ 449,800	$ 405,300
Total unrecognized compensation expense	$ 3,600,000
Weighted average period for recognition of unrecognized compensation expense	2 years 3 months 18 days
2001 Plan
Stock Option Plans
Number of shares authorized for issuance	750,000
2010 Plan
Stock Option Plans
Number of shares authorized for issuance	500,000
Nonemployee Directors Plan
Stock Option Plans
Number of shares authorized for issuance	350,000