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Balance Sheet Information - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 30, 2021
Jul. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Feb. 28, 2022
Feb. 28, 2021
Condensed Balance Sheet Statements Captions [Line Items]              
Asset impairment     $ 171,824,000        
Impairment of operating lease right-of-use assets     200,000 $ 0 $ 0    
Depreciation expense     80,500,000 81,200,000 80,800,000    
Estimated initial equity warrant asset value             $ 16,400,000
Warrant asset value     16,400,000        
Losses on investments     13,715,000 6,816,000      
Estimated initial warrant asset value           $ 3,200,000  
Net losses on investments in equity securities     13,700,000        
Aggregate carrying amount of investments in equity securities     15,200,000        
Investments without readily determinable fair value     9,000,000.0        
Archer Aviation, Inc. [Member]              
Condensed Balance Sheet Statements Captions [Line Items]              
Losses on investments     13,700,000 6,800,000      
Heart Aerospace Incorporated [Member] | Forward Purchase Contract [Member] | Preferred Stock [Member]              
Condensed Balance Sheet Statements Captions [Line Items]              
Purchase of preferred stock   $ 5,000,000.0          
Initial investment in preferred stock measured at cost   $ 5,000,000.0          
Class A [Member] | Archer Aviation, Inc. [Member]              
Condensed Balance Sheet Statements Captions [Line Items]              
Stock issued during period, Shares 500,000            
Stock issued during period, Value $ 5,000,000.0            
Total grant date value, Additional warrant to purchase shares $ 5,600,000            
CRJ-900 [Member]              
Condensed Balance Sheet Statements Captions [Line Items]              
Asset impairment     109,700,000        
Impairment of property and equipment     $ 92,600,000        
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]     Asset impairment        
Impairment of operating lease right-of-use assets     $ 15,200,000        
Impairment of intangible asset     $ 1,900,000        
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]     Asset impairment        
CRJ-900 [Member] | Long Lived Assets [Member]              
Condensed Balance Sheet Statements Captions [Line Items]              
Asset impairment       $ 0 $ 0