Summary of Significant Accounting Policies - Additional Information (Details) - Segment	6 Months Ended	12 Months Ended
Aug. 01, 2015	Jan. 31, 2015
Accounting Policies [Abstract]
Fiscal Period Duration	364 days	364 days
Number of reportable segment	1

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration