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Balance Sheet Information - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jul. 31, 2021
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Feb. 28, 2022
Feb. 28, 2021
Condensed Balance Sheet Statements Captions [Line Items]                  
Depreciation expense     $ 8,000,000 $ 13,300,000 $ 40,000,000 $ 60,200,000 $ 80,500,000    
Estimated initial equity warrant asset value                 $ 16,400,000
Investments in equity securities     300,000   300,000 20,320,000      
Total net unrealized (loss)/gain     (42,000) 2,500,000 (6,100,000) 5,400,000 (13,700,000)    
Estimated initial warrant asset value               $ 3,200,000  
Total realized gain (loss) on equity securities     0 $ 0 8,000,000 0 $ 0    
Aggregate carrying amount of investments in equity securities     300,000   300,000 20,300,000      
Investments without readily determinable fair value     300,000   300,000 8,800,000      
United Capacity Purchase Agreement [Member]                  
Condensed Balance Sheet Statements Captions [Line Items]                  
Realized and unrealized gain (loss) on investment         7,200,000        
Debt reduction         12,600,000        
Archer Aviation, Inc. [Member] | Level 1 [Member]                  
Condensed Balance Sheet Statements Captions [Line Items]                  
Proceeds from sale         9,600,000        
Gain on sale         800,000        
Realized and unrealized gain (loss) on investment         (2,700,000) $ 5,600,000      
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              
Initial investment in preferred stock measured at cost   $ 5,000,000              
VTOL Aircraft, XTI Aerospace, Inc [Member] | Level 1 [Member]                  
Condensed Balance Sheet Statements Captions [Line Items]                  
Realized and unrealized gain (loss) on investment     $ (42,000)   $ (3,500,000)        
Class A [Member] | Archer Aviation, Inc. [Member]                  
Condensed Balance Sheet Statements Captions [Line Items]                  
Number of shares sold 500,000                
Proceeds from sale $ 5,000,000                
Total grant date value, Additional warrant to purchase shares $ 5,600,000