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Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
AIRCRAFT
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
AIRCRAFT
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
AIRCRAFT
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Lessee, Lease, Description [Line Items]              
Number of leased aircraft under finance lease | AIRCRAFT         2    
Finance lease obligations         $ 4,700    
Operating lease, right-of-use assets $ 7,050   $ 7,050   7,231 $ 9,709  
Operating lease current liabilities 1,535   1,535   1,681 3,510  
Operating lease noncurrent liabilities $ 6,890   $ 6,890   6,863 8,077  
Financing lease current         $ 1,800    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]         Current portion of long-term debt and finance leases    
Number of leased aircraft | AIRCRAFT 23   23   32    
Financing lease noncurrent liabilities         $ 2,900    
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]         Long-term debt and finance leases, excluding current portion    
Operating lease payments in operating cash flows     $ 1,417 $ 2,858 $ 4,585 9,476 $ 36,262
Aggregate rental expense under all operating aircraft, equipment and facility lease         13,900 12,200 $ 43,400
Financing lease payments in operating cash flows         2,000 1,200  
Financing lease payments in financing cash flows         65,300 15,100  
Aggregate rental expense under all operating aircraft, equipment and facility leases $ 2,840 $ 4,595 $ 6,109 $ 12,565 $ 22,547 $ 30,114  
Weighted average remaining lease term Operating leases 6 years 2 months 12 days   6 years 2 months 12 days   6 years 6 months    
Weighted average discount rate Operating leases 5.40%   5.40%   6.00%