Basis of Presentation and Summary of Significant Accounting Policies - Sales Revenue by Similar Products (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 08, 2018	Sep. 09, 2017	Sep. 08, 2018	Sep. 09, 2017
Concentration Risk [Line Items]
Net sales and other revenue	$ 14,024.1	$ 13,831.7	$ 32,677.5	$ 32,291.7
Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 14,024.1	$ 13,831.7	$ 32,677.5	$ 32,291.7
Percentage of total net sales and other revenue	100.00%	100.00%	100.00%	100.00%
Non-perishables | Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 6,089.8	$ 6,217.2	$ 14,153.1	$ 14,410.5
Percentage of total net sales and other revenue	43.40%	44.90%	43.30%	44.70%
Perishables | Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 5,775.5	$ 5,595.1	$ 13,502.6	$ 13,158.7
Percentage of total net sales and other revenue	41.20%	40.50%	41.30%	40.70%
Pharmacy | Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 1,125.3	$ 1,136.7	$ 2,652.5	$ 2,671.1
Percentage of total net sales and other revenue	8.00%	8.20%	8.10%	8.30%
Fuel | Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 856.0	$ 715.7	$ 1,954.1	$ 1,659.7
Percentage of total net sales and other revenue	6.10%	5.20%	6.00%	5.10%
Other | Sales Revenue, Product Line | Product Concentration Risk
Concentration Risk [Line Items]
Net sales and other revenue	$ 177.5	$ 167.0	$ 415.2	$ 391.7
Percentage of total net sales and other revenue	1.30%	1.20%	1.30%	1.20%