Document and Entity Information - USD ($)	12 Months Ended
	Nov. 30, 2018	Jan. 31, 2019	May 31, 2018
Document and Entity Information
Entity Registrant Name	GRIFFIN INDUSTRIAL REALTY, INC.
Entity Central Index Key	0001037390
Document Type	10-K
Document Period End Date	Nov. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--11-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 111,373,000
Entity Common Stock, Shares Outstanding		5,065,173
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY