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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
May 05, 2018
Apr. 29, 2017
May 05, 2018
Dec. 31, 2017
Income Taxes        
Income tax benefit $ 1,379 $ 2,410    
Estimated annual effective tax rate 19.10% 34.80%    
Federal statutory rate     21.00% 35.00%