Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax Expense
Tax at U.S. federal statutory rate	$ 39,989,000	$ 37,138,000	$ 34,438,000
State and local income taxes	1,896,000	1,820,000	1,936,000
Foreign income taxes	2,368,000	1,974,000	1,669,000
Settlement of certain tax issues	117,000	(909,000)	305,000
Income of consolidated partnerships attributable to noncontrolling interests	(1,608,000)	(1,263,000)	(1,604,000)
Non-qualified deferred compensation plan (income) loss	(171,000)	(599,000)	(355,000)
Tax credits and other	(6,033,000)	(5,031,000)	(3,996,000)
Total	36,558,000	33,130,000	32,393,000
Income Tax Rate
Tax at U.S. federal statutory rate (as a percent)	35.00%	35.00%	35.00%
State and local income taxes (as a percent)	1.70%	1.70%	2.00%
Foreign income taxes (as a percent)	2.10%	1.90%	1.70%
Settlement of certain tax issues (as a percent)	0.10%	(0.90%)	0.30%
Income of consolidated partnerships attributable to noncontrolling interests (as a percent)	(1.40%)	(1.20%)	(1.60%)
Non-qualified deferred compensation plan (income) loss (as a percent)	(0.20%)	(0.60%)	(0.40%)
Tax credits and other (as a percent)	(5.30%)	(4.70%)	(4.10%)
Total	32.00%	31.20%	32.90%
Income taxes paid	27,000,000	29,300,000	25,300,000
Decrease in liability for unrecognized tax benefits resulting from finalization of current examinations and other issues	$ 546,000