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Revenues - Schedule of Reconciliation of Contract Liabilities with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning $ 96 $ 234
Consideration Received (Refunded) 967 974
Recognized in Revenue (964) (1,112)
Contract liabilities with customers ending 99 96
Ad revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 49 82
Consideration Received (Refunded) 422 451
Recognized in Revenue (440) (484)
Contract liabilities with customers ending 31 49
Expo revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 1 8
Consideration Received (Refunded) 519 574
Recognized in Revenue (519) (581)
Contract liabilities with customers ending 1 1
Other    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 46 144
Consideration Received (Refunded) 26 (51)
Recognized in Revenue (5) (47)
Contract liabilities with customers ending $ 67 $ 46