XML 40 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information - USD ($)
12 Months Ended
Nov. 30, 2019
Jan. 31, 2020
May 31, 2019
Document and Entity Information      
Document Type 10-K    
Document Period End Date Nov. 30, 2019    
Entity Registrant Name GRIFFIN INDUSTRIAL REALTY, INC.    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Interactive Data Current Yes    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   5,075,120  
Entity Public Float     $ 102,655,000
Current Fiscal Year End Date --11-30    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001037390    
Amendment Flag false