Income Taxes Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2012	Dec. 29, 2011	Dec. 30, 2010
Federal:
Current	$ 3.8	$ 4.7	$ 3.0
Deferred	(0.1)	(1.8)	(0.8)
Total Federal	3.7	2.9	2.2
State:
Current	1.2	0.6	0.3
Deferred	2.9	1.0	0.6
Total State	4.1	1.6	0.9
Total income tax provision	$ 7.8	$ 4.5	$ 3.1