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Leases - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
AirCraft
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Lessee, Lease, Description [Line Items]            
Operating lease, right-of-use assets $ 6,588,000   $ 7,231,000 $ 9,709,000    
Operating lease current liabilities 1,430,000   1,681,000 3,510,000    
Operating lease noncurrent liabilities $ 6,484,000   6,863,000 8,077,000    
Number of leased aircraft | AirCraft 24          
Operating lease payments in operating cash flows $ 786,000 $ 1,211,000 4,585,000 9,476,000 $ 36,262,000  
Aggregate rental expense under all operating aircraft, equipment and facility lease 3,100,000 2,600,000 13,900,000 12,200,000 43,400,000  
Financing lease payments in operating cash flows 0 0 2,000,000 1,200,000 300,000  
Financing lease payments in financing cash flows 0 300,000 65,300,000 15,100,000 2,500,000  
Impairment loss 60,700,000 0 0 0 10,500,000  
Deferred income taxes 2,937,000   8,173,000 8,414,000    
Cash, cash equivalents and availability under lines of credit $ 42,984,000 $ 19,202,000 $ 18,630,000 $ 36,072,000 $ 61,025,000 $ 123,867,000