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Management's Assessment of Going Concern (Details)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Aug. 29, 2018
USD ($)
property
Aug. 29, 2018
USD ($)
Jun. 06, 2018
USD ($)
Mar. 14, 2018
USD ($)
Aug. 30, 2017
USD ($)
Jun. 07, 2017
USD ($)
Mar. 15, 2017
USD ($)
Dec. 20, 2017
USD ($)
Dec. 21, 2016
USD ($)
Aug. 29, 2018
USD ($)
Aug. 30, 2017
USD ($)
Aug. 31, 2016
USD ($)
Sep. 14, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net loss   $ 1,864 $ 14,596 $ 11,571 $ 4,101 $ 396 $ 13,179 $ 5,537 $ 5,586 $ 33,568 $ 23,262 $ 10,346  
Cash used in operations                   8,453 (9,640) (13,859)  
Credit facility debt $ 39,338 $ 39,338 $ 39,500   $ 0         39,338 0    
Proceeds from disposal of assets and property held for sale                   $ 14,191 $ 9,286 $ 4,794  
Disposal Group, Disposed of by Sale | Owned Properties                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of properties classified as discontinued operations or property held for sale | property 8                        
Proceeds from disposal of assets and property held for sale $ 11,600                        
Subsequent Event | Minimum | Disposal Group, Held-for-sale                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Expected Proceeds From Sale Of Productive Assets                         $ 25,000
Subsequent Event | Maximum | Disposal Group, Held-for-sale                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Expected Proceeds From Sale Of Productive Assets                         $ 45,000