Note 12 - Segment Information (Details Textual) $ in Thousands	3 Months Ended
Feb. 27, 2021 USD ($)	Feb. 29, 2020 USD ($)
Number of Reportable Segments	3
SGA Expenses Excluding New Store Pre-opening Costs	$ 59,400	$ 64,640
Zenith Freight Lines [Member]
SGA Expenses Excluding New Store Pre-opening Costs	$ 19,621	$ 20,480

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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