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Income Taxes (Details) - USD ($)
$ in Millions
Jul. 28, 2017
Jan. 27, 2017
Jul. 29, 2016
Income Tax Examination [Line Items]      
Unrecognized tax benefits $ 6.9    
Unrecognized tax benefits, if recognized, would impact effective tax rate 4.5    
Amount of interest and penalties recognized 5.3    
Amount of interest and penalties recognized, net of federal benefit 3.4    
Sears Holdings Corporation | Other assets      
Income Tax Examination [Line Items]      
Indemnification receivable, uncertain tax positions $ 11.8 $ 11.4 $ 14.2