Significant Accounting Policies: (Details) (USD $)	12 Months Ended
	Dec. 29, 2012 item	Dec. 31, 2011	Dec. 25, 2010
Receivables
Allowance for doubtful accounts	$ 17,300	$ 15,100	$ 17,400
Leasing Income Recognition
Threshold delinquent period of lease rentals to classify lease as non-accrual	90 days
Minimum monthly payments owed to classify lease as non-accrual	3
Allowance for Credit Losses
Delinquent period for charging-off against allowance for credit losses	121 days
Rents Received in Advance
Number of advance payments to be applied to the customer's last payment	1
Number of advance payments to be applied to the customer's last two payments	2
Number of rent payments covered by two advance payments	2
Canada
Cash equivalents
Cash located in banks	$ 107,400	$ 227,000