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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2013	Sep. 27, 2012	Sep. 26, 2013	Sep. 27, 2012	Dec. 27, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 2.4	$ 2.0	$ 4.6	$ 5.2
Effective tax rates (as a percent)	38.70%	38.50%	39.30%	39.10%
Valuation allowance against deferred tax assets	$ 2.4		$ 2.4		$ 2.4

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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