Business and basis of presentation (Details)	12 Months Ended
Feb. 02, 2019 store state segment
Business and basis of presentation
Number of stores operated \| store	1,174
Number of states in which entity operates \| state	50
Number of reportable segments \| 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