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Leases - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2022
USD ($)
Air-craft
Engine
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 23, 2005
USD ($)
Airfleet
Operating Leased Assets [Line Items]            
Number of leased aircraft | Air-craft 16          
Aggregate rental expense under all operating aircraft, equipment and facility leases $ 43,400,000 $ 44,600,000 $ 51,400,000      
Number of leased aircraft under finance lease | Air-craft 2          
Number of spare engines leased under finance lease | Engine 3          
Finance lease obligations $ 18,000,000.0          
Operating lease, right-of-use assets 43,090,000 93,100,000        
Operating lease current liabilities 17,233,000 32,652,000        
Operating lease noncurrent liabilities 16,732,000 33,991,000        
Financing lease current $ 2,700,000          
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Current portion of long-term debt and finance leases          
Financing lease noncurrent liabilities $ 15,300,000          
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 $ 36,262,000 47,612,000 44,173,000      
Financing lease payments in operating cash flows 300,000 600,000        
Financing lease payments in financing cash flows 2,500,000 2,300,000        
Impairment loss 200,000 0 0      
Cash, cash equivalents and availability under lines of credit 61,025,000 123,867,000 $ 102,841,000   $ 72,501,000  
Deferred income taxes 17,719,000 $ 69,940,000        
RASPRO Aircraft Lease Agreement [Member]            
Operating Leased Assets [Line Items]            
Deferred income taxes       $ 4,000,000.0    
CRJ-900 Aircraft [Member] | RASPRO Aircraft Lease Agreement [Member]            
Operating Leased Assets [Line Items]            
Number of leased aircraft | Airfleet           15
Cash, cash equivalents and availability under lines of credit           $ 35,000,000.0
CRJ-900 Aircraft [Member]            
Operating Leased Assets [Line Items]            
Impairment loss $ 15,200,000