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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2019
Apr. 30, 2019
Promissory note receivable from Founders            
Financial assets:            
Notes receivable, fair value       $ 15,000    
Promissory note receivable from Founders | Carrying Value            
Financial assets:            
Notes receivable, fair value $ 16,921 $ 15,722 $ 17,706      
Promissory note receivable from Founders | Estimated Fair Value            
Financial assets:            
Notes receivable, fair value 16,921 15,722 17,706      
Promissory note receivable from Founders | Estimated Fair Value | Level 1            
Financial assets:            
Notes receivable, fair value 0 0 0      
Promissory note receivable from Founders | Estimated Fair Value | Level 2            
Financial assets:            
Notes receivable, fair value 0 0 0      
Promissory note receivable from Founders | Estimated Fair Value | Level 3            
Financial assets:            
Notes receivable, fair value 16,921 15,722 17,706      
Investments in unconsolidated affiliates | Carrying Value            
Financial assets:            
Investments in unconsolidated affiliates 13,967 13,329 13,162      
Investments in unconsolidated affiliates | Estimated Fair Value            
Financial assets:            
Investments in unconsolidated affiliates 42,199 42,496 41,135      
Investments in unconsolidated affiliates | Estimated Fair Value | Level 1            
Financial assets:            
Investments in unconsolidated affiliates 41,349 41,646 40,285      
Investments in unconsolidated affiliates | Estimated Fair Value | Level 2            
Financial assets:            
Investments in unconsolidated affiliates 0 0 0      
Investments in unconsolidated affiliates | Estimated Fair Value | Level 3            
Financial assets:            
Investments in unconsolidated affiliates 850 850 850      
2024 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value     34,347      
2024 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value     34,303      
2024 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value     0      
2024 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value     34,303      
2024 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value     0      
2025 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value 103,325 103,072 102,817      
2025 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value 104,024 100,401 97,171      
2025 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value 0 0 0      
2025 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value 104,024 100,401 97,171      
2025 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value 0 0 0      
2029 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value 224,723 224,256 223,756      
2029 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value 338,089 273,700 268,893      
2029 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value 0 0 0      
2029 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value 338,089 273,700 268,893      
2029 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value 0 $ 0 0      
2032 Senior Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value 292,465          
2032 Senior Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value 305,117          
2032 Senior Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value 0          
2032 Senior Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value 305,117          
2032 Senior Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value $ 0          
Promissory note receivable due April 2024            
Financial assets:            
Notes receivable, fair value         $ 1,100 $ 1,100
Promissory note receivable due April 2024 | Carrying Value            
Financial assets:            
Notes receivable, fair value     1,268      
Promissory note receivable due April 2024 | Estimated Fair Value            
Financial assets:            
Notes receivable, fair value     1,268      
Promissory note receivable due April 2024 | Estimated Fair Value | Level 1            
Financial assets:            
Notes receivable, fair value     0      
Promissory note receivable due April 2024 | Estimated Fair Value | Level 2            
Financial assets:            
Notes receivable, fair value     0      
Promissory note receivable due April 2024 | Estimated Fair Value | Level 3            
Financial assets:            
Notes receivable, fair value     $ 1,268