Description of Business - Additional Information (Details)	3 Months Ended
Apr. 30, 2016 Stores States Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of stores \| Stores	67
Number of states \| States	20
Number of reportable segment \| 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