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Business Operations - Assets held for sale (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 05, 2020
USD ($)
a
Jul. 29, 2020
USD ($)
a
Jul. 26, 2019
USD ($)
a
Mar. 02, 2018
USD ($)
Sep. 01, 2017
USD ($)
a
May 26, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
a
Sep. 30, 2020
USD ($)
Jun. 25, 2019
USD ($)
Aug. 17, 2017
USD ($)
a
Business Operations                      
Gain on sale of land             $ 4,843,000 $ 8,510,000 $ 4,843,000    
Nashville Superspeedway | Assets held for sale                      
Business Operations                      
Acres | a 350             650      
Non-refundable deposit $ 500,000                    
Proceeds, less closing costs $ 14,355,000                    
Nashville Superspeedway | Land                      
Business Operations                      
Acres | a   97 133   88           147
Purchase price (per acre)                     $ 35,000
Option purchase price (per acre)         $ 55,000            
Non-refundable deposit                   $ 500,000  
Period of option to execute the agreement         3 years            
Proceeds, less closing costs   $ 6,460,000 $ 6,397,000 $ 4,945,000   $ 14,326,000          
Net proceeds after taxes   5,290,000 5,314,000 4,150,000   12,000,000          
Gain on sale of land   $ 4,843,000 $ 4,186,000 $ 2,512,000   $ 8,510,000