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Loss Per Share (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Earnings Per Share [Abstract]        
Stock options and restricted stock units not included in the computation of diluted earnings per share (in shares) 1.5 1.4 1.5 1.3