Basis of Financial Statement Presentation (Details)	3 Months Ended	6 Months Ended	12 Months Ended
Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jan. 28, 2017
Accounting Policies [Abstract]
Number of weeks in fiscal year			371 days	364 days
Number of weeks in fiscal quarter	P13W	P13W

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

No definition available.

Name:	us-gaap_FiscalPeriodDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration