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Leases - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Leases [Abstract]      
Operating lease, impairment loss $ 1,000,000 $ 0 $ 0
Operating Lease Income Comprehensive Income Extensible List Not Disclosed Flag operating lease revenue operating lease revenue operating lease revenue
Operating lease revenue $ 1,800,000 $ 1,600,000 $ 1,500,000
2024 1,700,000    
2025 1,400,000    
2026 380,000    
2027 320,000    
2028 292,000    
Thereafter $ 802,000