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Loss Per Share (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Earnings Per Share [Abstract]        
Stock options and restricted stock units not included in the computation of diluted earnings per share (in shares) 1.6 1.5 1.5 1.4