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Asset Sale to WBA - Carrying amount of assets to be sold (Details) - USD ($)
$ in Thousands
6 Months Ended
Aug. 31, 2019
Mar. 03, 2019
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]    
Current assets held for sale      
Current assets held for sale $ 145,213 $ 161,278 $ 117,581
Current liabilities held for sale      
Current liabilities held for sale 43,364 $ 45,167  
Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member] | Assets held for sale      
Current assets held for sale      
Inventories 54,761   68,233
Property and equipment 49,346   49,348
Operating lease right-of-use asset 41,106    
Current assets held for sale 145,213   $ 117,581
Current liabilities held for sale      
Current portion of operating lease liabilities 3,798    
Long-term operating lease liabilities 39,566    
Current liabilities held for sale $ 43,364