Business and basis of presentation - Additional Information (Detail)	May 04, 2013 State Store
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of stores	576
Number of states in which entity operates	46

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant