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Impairment and other charges, net Impairment and other charges, net (Details) - USD ($)
$ in Thousands
4 Months Ended
Jan. 20, 2019
Jan. 21, 2018
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]    
Restructuring costs $ 5,840 $ 358
Costs of closed restaurants and other 866 1,447
Losses on disposition of property and equipment, net (635) (183)
Accelerated depreciation 416 57
Operating restaurant impairment charges (1) [1] 0 211
Impairment And Other Costs Net 7,698 2,257
Continuing Operations [Member]    
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]    
Losses on disposition of property and equipment, net $ 576 $ 184
[1] In 2018, impairment charges relate to our landlord’s sale of a restaurant property to a franchisee.