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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
AirCraft
Segment
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of operating segments | Segment 1        
Number of reportable segments | Segment 1        
Outstanding letters of credit to be collateralized by amounts on deposit, classified as restricted cash $ 3,000,000   $ 3,000,000 $ 3,100,000  
Asset impairment 65,665,000 $ 40,384,000 73,709,000 54,343,000 $ 171,824,000
Impairment loss held for sale $ 4,900,000 40,400,000 73,700,000 50,600,000 62,100,000
Revenue recognition percentage (9.80%)        
Lease revenue $ 20,200,000 $ 34,900,000 $ 123,000,000 $ 144,700,000 $ 158,400,000
Deferred revenue $ 15,300,000        
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Contract revenue Contract revenue Contract revenue Contract revenue Contract revenue
Current and non-current deferred credit balances $ 3,100,000   $ 4,100,000 $ 5,100,000  
Recognized deferred credits within contract revenue 1,000,000 $ 1,000,000 1,800,000 1,700,000 $ 900,000
Contract assets balances 5,400,000   6,100,000 8,800,000  
Contract cost amortization 700,000 400,000 2,700,000 1,000,000 0
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense 1,100,000 800,000 3,200,000 3,100,000 1,900,000
Deferred heavy maintenance balance, net of accumulated amortization 5,400,000   6,400,000 8,000,000  
Engine overhaul expense 10,100,000 5,800,000 23,000,000 32,400,000 23,600,000
Engine overhaul pass-through expense 10,100,000 5,700,000 23,500,000 31,900,000 21,700,000
Insurance claim reimbursement net of engine overhaul expense     500,000    
Airframe check expense 8,400,000 6,400,000 22,900,000 23,400,000 22,100,000
Airframe check pass-through expense 7,700,000 3,800,000 16,300,000 16,900,000 3,200,000
Impairment loss $ 60,700,000 0 0 0 10,500,000
Number of aircraft leased | AirCraft 1        
Net loss $ (111,944,000) (57,850,000) (91,015,000) (120,116,000) (182,678,000)
Cash flow used in operations 11,561,000 $ 7,841,000 (34,244,000) 24,091,000 (13,362,000)
Working capital deficit 92,000,000        
Accumulated deficit (274,078,000)   (162,134,000) (71,119,000)  
Cash and cash equivalents $ 39,980,000   15,621,000 32,940,000  
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember        
Property and Equipment [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Asset impairment         109,700,000
Other Long-lived Assets [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Asset impairment         $ 109,700,000
Long Lived Assets [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Asset impairment $ 60.7   0 0  
Aircraft [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Allowance for obsolete expendable parts and supplies $ 4,700,000   $ 4,700,000 $ 4,100,000  
Aircraft and Rotable Spare Parts [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, salvage value, percentage 20.00%        
Letter of Credit [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Letter of credit facility, amount $ 6,000,000