Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 26, 2014	Jun. 27, 2013	Jun. 26, 2014	Jun. 27, 2013	Dec. 26, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1.5	$ 1.7	$ 2.5	$ 2.2
Effective tax rates (as a percent)	41.70%	39.50%	40.30%	40.00%
Valuation allowance against deferred tax assets	$ 2.4		$ 2.4		$ 2.4