Sale Leaseback Transaction (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Aug. 25, 2014 extension property	Dec. 28, 2014	Aug. 25, 2014 property	Dec. 29, 2013
Leases [Abstract]
Number of properties sold			49
Number of properties leased			49
Initial lease term	20 years
Number of extension options	4
Duration of extension option	5 years
Gross proceeds	$ 183.7
Sale leaseback obligations, less current portion		181.3
Sale leaseback obligations, current portion		1.7
Net proceeds	143.2
Net book value		$ 84.3		$ 98.7