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ACQUISITIONS - Fiscal 2016 Acquisitions (Details)
$ in Millions
12 Months Ended 14 Months Ended
Mar. 25, 2016
USD ($)
store
Feb. 23, 2019
USD ($)
Feb. 24, 2018
USD ($)
Feb. 25, 2017
USD ($)
Feb. 27, 2016
store
Jun. 02, 2016
USD ($)
Business Acquisition [Line Items]            
Goodwill   $ 1,183.3 $ 1,183.3 $ 1,167.8    
Net cash paid for acquisitions   0.0 148.8 220.6    
Goodwill acquired during period   $ 0.0 $ 157.8      
Haggen Transaction            
Business Acquisition [Line Items]            
Number of stores acquired | store 29       29  
Number of stores acquired that were sold to Haggen previously | store 15          
Total purchase consideration $ 113.8          
Goodwill           $ 16.1
Individually immaterial business acquisitions            
Business Acquisition [Line Items]            
Net cash paid for acquisitions       106.8    
Goodwill acquired during period       $ 20.6