Organization - Additional Information (Detail) Person in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Jul. 27, 2019 Store segment	Jan. 26, 2019 Person	Apr. 27, 2019 segment
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of Stores \| Store	1,491
Number of students covered to build relationships and derive sales \| Person		6
Number of Reportable Segments \| segment	3		3

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