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Fair Value Measurements - Financial Assets, Temporary Equity and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
2.89% promissory note receivable due April 2024    
Financial liabilities:    
Notes receivable, interest rate 2.89% 2.89%
2.89% promissory note receivable due April 2024 | Carrying Value    
Financial assets:    
Notes receivable $ 1,181 $ 1,148
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement    
Financial assets:    
Notes receivable 1,181 1,148
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 1,181 1,148
Investments in unconsolidated affiliates | Carrying Value    
Financial assets:    
Investments in unconsolidated affiliates 37,724 32,458
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement    
Financial assets:    
Investments in unconsolidated affiliates 48,954 32,597
Investments in unconsolidated affiliates | Estimate of Fair Value Measurement | Level 1    
Financial assets:    
Investments in unconsolidated affiliates 41,638 24,833
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 7,316 7,764
2024 Convertible Notes | Carrying Value    
Financial liabilities:    
Debt instrument, fair value 123,543 117,193
2024 Convertible Notes | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value 153,281 129,979
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 153,281 129,979
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 140,643 133,164
2025 Convertible Notes | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value 155,250 137,569
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 155,250 137,569
2025 Convertible Notes | Estimate of Fair Value Measurement | Level 3    
Financial liabilities:    
Debt instrument, fair value $ 0 $ 0
8.5% unsecured debt due 2024    
Financial liabilities:    
Stated interest rate   8.50%
8.5% unsecured debt due 2024 | Carrying Value    
Financial liabilities:    
Debt instrument, fair value   $ 872
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value   872
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 1    
Financial liabilities:    
Debt instrument, fair value   0
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 2    
Financial liabilities:    
Debt instrument, fair value   0
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 3    
Financial liabilities:    
Debt instrument, fair value   $ 872