Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 29, 2017 USD ($) stores	Jul. 29, 2017 USD ($) stores
Net tax deficiencies from share based payment accounting | $	$ 1	$ 12
Number of states in which entity operates	45	45
Minimum [Member]
Number of Stores | stores	850	850