Document and Entity Information - shares	9 Months Ended
	Aug. 31, 2018	Sep. 28, 2018
Document and Entity Information
Entity Registrant Name	GRIFFIN INDUSTRIAL REALTY, INC.
Entity Central Index Key	0001037390
Document Type	10-Q
Document Period End Date	Aug. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--11-30
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		5,045,050
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3