Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Employee Benefit Plans
Deferred compensation plan assets, noncurrent	$ 21,700,000	$ 17,900,000
Deferred compensation liability classified, noncurrent	$ 22,047,000	$ 18,483,000
Employer discretionary matching contribution made to 401(k) plan and non-qualified deferred compensation plan, percentage	3.00%	3.00%	1.50%
Maximum employee contribution percentage eligible for employer match	6.00%	6.00%	6.00%
Costs of 401(k) plan and non-qualified deferred compensation plan	$ 2,600,000	$ 1,500,000	$ 734,000