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Discontinued Operations - Sale of Cable TV Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
May 29, 2019
Nov. 29, 2018
Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total book value of assets sold $ 15,695        
Cable TV Business Segment          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received from real estate facility sales     $ 3,900    
Promissory note from sale of Cable TV segment     $ 6,400    
Net purchase price   $ 14,200      
Pretax loss on sale of discontinued operations   1,500      
Cable TV Business Segment | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received from real estate facility sales   7,075      
Cash received from sale of Cable TV segment   753      
Promissory note from sale of Cable TV segment   6,375      
Net purchase price   $ 14,203   $ 7,128 $ 7,075
Total book value of assets sold         $ 4,763
Pretax loss on sale of discontinued operations (1,492)        
Cable TV segment | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total book value of assets sold 10,932        
Real estate facilities | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total book value of assets sold $ 4,763