Assets and Liabilities Held for Sale and Discontinued Operations - Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		4 Months Ended	3 Months Ended					1 Months Ended
	Mar. 22, 2014 plan	Mar. 23, 2013	Dec. 28, 2013	Mar. 22, 2014 Dominick's Stores [Member]	Mar. 23, 2013 Dominick's Stores [Member]	Dec. 28, 2013 Dominick's Stores [Member] plan	Mar. 22, 2014 Minimum [Member]	Mar. 22, 2014 Maximum [Member]	Apr. 30, 2013 Subsequent Event [Member] letter
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale of stores			$ 72.2	$ 78.3
Pre-tax gain (loss) from sale of stores	37.0	0	(493.1)	42.1	0
Multi-employer pension plan withdrawal liability	347.3		310.8
Demand letters received									2
Number of multiemployer pension plans						4
Increase in multi-employer pension plan withdrawal liability	33.8
Reduction in earnings from discontinued operations from increase in multi-employer pension plan withdrawal liability, net of tax	21.1
Multiemployer pension plan, withdrawal obligation annual installment							$ 10	$ 20
Multiemployer pension plan, withdrawal obligation payment period	20 years
Number of multiemployer pension plans that may send demand letters in 2014 or later	2