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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2019
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2019
Financial assets:        
Other investments   $ 24,220 $ 0  
Carrying Value        
Financial assets:        
Other investments   24,220    
Estimate of Fair Value Measurement        
Financial assets:        
Other investments   24,220    
Estimate of Fair Value Measurement | Level 1        
Financial assets:        
Other investments   0    
Estimate of Fair Value Measurement | Level 2        
Financial assets:        
Other investments   0    
Estimate of Fair Value Measurement | Level 3        
Financial assets:        
Other investments   $ 24,220    
2.89% promissory note receivable due April 2024        
Financial assets:        
Notes receivable $ 1,100     $ 1,100
Financial liabilities:        
Interest on note receivable 2.89% 2.89% 2.89%  
2.89% promissory note receivable due April 2024 | Carrying Value        
Financial assets:        
Notes receivable   $ 1,215 $ 1,181  
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement        
Financial assets:        
Notes receivable   1,215 1,181  
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement | Level 1        
Financial assets:        
Notes receivable   0 0  
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement | Level 2        
Financial assets:        
Notes receivable   0 0  
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement | Level 3        
Financial assets:        
Notes receivable   1,215 1,181  
Investments in unconsolidated affiliates | Carrying Value        
Financial assets:        
Investments in unconsolidated affiliates   37,733 37,724  
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement        
Financial assets:        
Investments in unconsolidated affiliates   40,279 48,954  
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement | Level 1        
Financial assets:        
Investments in unconsolidated affiliates   40,279 41,638  
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement | Level 2        
Financial assets:        
Investments in unconsolidated affiliates   0 0  
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement | Level 3        
Financial assets:        
Investments in unconsolidated affiliates   0 7,316  
2024 Convertible Notes | Carrying Value        
Financial liabilities:        
Debt instrument, fair value   142,575 123,543  
2024 Convertible Notes | Estimate of Fair Value Measurement        
Financial liabilities:        
Debt instrument, fair value   157,727 153,281  
2024 Convertible Notes | Estimate of Fair Value Measurement | Level 1        
Financial liabilities:        
Debt instrument, fair value   0 0  
2024 Convertible Notes | Estimate of Fair Value Measurement | Level 2        
Financial liabilities:        
Debt instrument, fair value   157,727 153,281  
2024 Convertible Notes | Estimate of Fair Value Measurement | Level 3        
Financial liabilities:        
Debt instrument, fair value   0 0  
2025 Convertible Notes | Carrying Value        
Financial liabilities:        
Debt instrument, fair value   170,328 140,643  
2025 Convertible Notes | Estimate of Fair Value Measurement        
Financial liabilities:        
Debt instrument, fair value   147,488 155,250  
2025 Convertible Notes | Estimate of Fair Value Measurement | Level 1        
Financial liabilities:        
Debt instrument, fair value   0 0  
2025 Convertible Notes | Estimate of Fair Value Measurement | Level 2        
Financial liabilities:        
Debt instrument, fair value   147,488 155,250  
2025 Convertible Notes | Estimate of Fair Value Measurement | Level 3        
Financial liabilities:        
Debt instrument, fair value   $ 0 $ 0