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Subsequent Events (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 11, 2018
USD ($)
a
Feb. 28, 2018
USD ($)
Nov. 30, 2018
Nov. 30, 2017
USD ($)
ft²
shares
Nov. 30, 2016
USD ($)
Nov. 30, 2015
USD ($)
Subsequent events            
Shares of Centaur Media common stock sold | shares       1,952,462    
Cash paid for building       $ 17,605 $ 15,734 $ 31,188
Income tax rate changes            
Federal income tax rate       35.00%    
Tenant bankruptcy            
Subsequent events            
Area Of Building | ft²       100,000    
Area of leased space | ft²       52,000    
Forecast            
Income tax rate changes            
Federal income tax rate     22.20%      
Minimum | Forecast            
Income tax rate changes            
Expected income tax expense   $ 1,000        
Maximum | Forecast            
Income tax rate changes            
Expected income tax expense   $ 1,100        
Subsequent events            
Subsequent events            
Number of acres | a 14          
Cash paid for building $ 3,600          
Income tax rate changes            
Federal income tax rate     21.00%