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Risk Management and Derivatives (Narrative) (Details)
6 Months Ended 12 Months Ended
Aug. 04, 2018
Jul. 29, 2017
Feb. 03, 2018
Derivative [Line Items]      
Derivative, Maturity Date Aug. 02, 2019    
Forward Contracts      
Derivative [Line Items]      
Derivative, Maturity Date Aug. 02, 2019 Aug. 03, 2018 Feb. 01, 2019