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Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Investment in Unconsolidated Affiliates (Details)
$ / shares in Units, $ in Millions, $ in Billions
3 Months Ended 12 Months Ended
Nov. 16, 2017
USD ($)
store
Feb. 24, 2018
USD ($)
$ / shares
Dec. 02, 2017
USD ($)
Feb. 24, 2018
USD ($)
Feb. 25, 2017
USD ($)
Feb. 27, 2016
USD ($)
Feb. 20, 2018
USD ($)
Feb. 20, 2018
MXN ($)
Schedule of Equity Method Investments [Line Items]                
Income from unconsolidated affiliates       $ 13.3 $ 17.5 $ 14.4    
Payment of Casa Ley contingent value right       $ 222.0 $ 0.0 $ 0.0    
El Rancho Supermercado                
Schedule of Equity Method Investments [Line Items]                
Number of stores acquired | store 16              
Total purchase consideration $ 100.0              
Payment to acquire businesses 70.0              
Amount of equity interest issued or issuable in a business combination $ 30.0              
Percentage of equity interest acquired 45.00%              
Remaining equity interest under contractual right to purchase, percent 55.00%              
Held-for-sale | Casa Ley                
Schedule of Equity Method Investments [Line Items]                
Amount of consideration to be received or receivable in asset disposal             $ 348.0 $ 6.5
Loss on disposal of equity method investment     $ 25.0          
Contingent consideration | Casa Ley                
Schedule of Equity Method Investments [Line Items]                
Payment of Casa Ley contingent value right   $ 222.0            
Distribution made in cash per Casa Ley CVR (dollars per share) | $ / shares   $ 0.934