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Revenue - Contract Balances (Details) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Change In Contract With Customer, Assets [Roll Forward]      
Contract assets - Beginning balance $ 10,091,000 $ 10,172,000  
Additional revenue recognized over-time 42,697,000 40,265,000  
Less amounts billed to the customers (42,043,000) (40,346,000)  
Contract assets - Ending balance 10,745,000 10,091,000  
Change In Contract With Customer, Liability [Roll Forward]      
Contract liabilities (included within Accrued liabilities) - Beginning balance (731,000) (154,000)  
Payments received in advance of performance obligations (5,737,000) (1,545,000)  
Performance obligations satisfied 3,589,000 968,000  
Contract liabilities (included within Accrued liabilities) - Ending balance (2,879,000) (731,000)  
Accounts receivable, net 17,272,000 15,638,000 $ 11,788,000
Impairment loss on contract assets $ 0 $ 0