Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2014 item	Dec. 31, 2013	Dec. 25, 2012
Defined Benefit Plan Disclosure [Line Items]
Number of retirement benefit plans	2
Expenses related to the Plans	$ 1,736	$ 1,724	$ 1,256
401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employees contribution of annual salaries	15.00%
Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employees contribution of annual salaries	80.00%