Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Feb. 03, 2018	Jan. 28, 2017
Fiscal Year [Line Items]
Fiscal Period Duration	91 days	91 days	182 days	182 days	371 days	364 days
Share-based Arrangements with Employees and Nonemployees [Abstract]
Share-based compensation, excess tax deficiency from vesting	$ 0.3		$ 2.0
Length of some fiscal years | Minimum
Fiscal Year [Line Items]
Fiscal Period Duration			364 days
Length of some fiscal years | Maximum
Fiscal Year [Line Items]
Fiscal Period Duration			371 days