Income Taxes - Reconciliation and Tax Act (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Income Tax Expense
Tax at U.S. federal statutory rate			$ 49,120,000	$ 55,583,000	$ 41,702,000
State and local income taxes			2,432,000	2,972,000	2,106,000
Foreign income taxes			5,306,000	3,143,000	2,432,000
Income of consolidated partnerships attributable to noncontrolling interests			(1,554,000)	(2,312,000)	(2,311,000)
Non-qualified deferred compensation plan (income) loss			(1,236,000)	(428,000)	218,000
Excess tax benefits on equity awards			(1,879,000)
Remeasurement of deferred taxes		$ (7,000,000)	(7,020,000)
Tax credits			(6,909,000)	(6,771,000)	(4,846,000)
Other			(4,443,000)	(2,470,000)	(2,118,000)
Total			$ 33,817,000	$ 49,717,000	$ 37,183,000
Income Tax Rate
Tax at U.S. federal statutory rate (as a percent)	21.00%		35.00%	35.00%	35.00%
State and local income taxes (as a percent)			1.70%	1.90%	1.80%
Foreign income taxes (as a percent)			3.80%	2.00%	2.00%
Income of consolidated partnerships attributable to noncontrolling interests (as a percent)			(1.10%)	(1.40%)	(1.90%)
Non-qualified deferred compensation plan (income) loss (as a percent)			(0.90%)	(0.30%)	0.20%
Excess tax benefits on equity awards (as a percent)			(1.40%)
Remeasurement of deferred taxes (as a percent)			(5.00%)
Tax credits (as a percent)			(4.90%)	(4.30%)	(4.10%)
Other (as a percent)			(3.10%)	(1.60%)	(1.80%)
Total (as a percent)			24.10%	31.30%	31.20%
Income taxes paid			$ 37,200,000	$ 35,100,000	$ 23,300,000
Decrease in liability for unrecognized tax benefits resulting from finalization of current examinations and other issues in the next 12 months		$ 337,000	$ 337,000