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Asset Sale to WBA - Carrying amount of assets to be sold (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 29, 2020
Mar. 02, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Discontinued Operation, Name of Segment [Extensible List] Retail Pharmacy [Member] Retail Pharmacy [Member]
Current assets held for sale    
Current assets held for sale $ 92,278 $ 117,581
Current liabilities held for sale    
Current liabilities held for sale 37,063  
Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member] | Assets held for sale    
Current assets held for sale    
Inventories 13,719 68,233
Property and equipment 43,576 49,348
Operating lease right-of-use asset 34,983  
Current assets held for sale 92,278 $ 117,581
Current liabilities held for sale    
Current portion of operating lease liabilities 2,002  
Long-term operating lease liabilities 35,061  
Current liabilities held for sale $ 37,063