Document and Entity Information - shares	6 Months Ended
	May 31, 2017	Jun. 30, 2017
Document and Entity Information
Entity Registrant Name	GRIFFIN INDUSTRIAL REALTY, INC.
Entity Central Index Key	0001037390
Document Type	10-Q
Document Period End Date	May 31, 2017
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		5,000,535
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2