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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, 2020
Sep. 30, 2019
Financial assets:    
Investments in unconsolidated affiliates $ 32,458 $ 34,516
Carrying Value    
Financial assets:    
Investments in unconsolidated affiliates 32,458 34,516
Estimate of Fair Value Measurement    
Financial assets:    
Investments in unconsolidated affiliates 32,597 28,308
Estimate of Fair Value Measurement | Level 1    
Financial assets:    
Investments in unconsolidated affiliates 24,833 20,252
Estimate of Fair Value Measurement | Level 2    
Financial assets:    
Investments in unconsolidated affiliates 0 0
Estimate of Fair Value Measurement | Level 3    
Financial assets:    
Investments in unconsolidated affiliates $ 7,764 8,056
Notes receivable from Grupo Finmart, net | Carrying Value    
Financial assets:    
Notes receivable   7,182
Notes receivable from Grupo Finmart, net | Estimate of Fair Value Measurement    
Financial assets:    
Notes receivable   7,582
Notes receivable from Grupo Finmart, net | Estimate of Fair Value Measurement | Level 1    
Financial assets:    
Notes receivable   0
Notes receivable from Grupo Finmart, net | Estimate of Fair Value Measurement | Level 2    
Financial assets:    
Notes receivable   0
Notes receivable from Grupo Finmart, net | Estimate of Fair Value Measurement | Level 3    
Financial assets:    
Notes receivable   $ 7,582
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 $ 1,148 $ 1,117
2.89% promissory note receivable due April 2024 | Estimate of Fair Value Measurement    
Financial assets:    
Notes receivable 1,148 1,117
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 1,148 1,117
2024 Convertible Notes | Carrying Value    
Financial liabilities:    
Debt instrument, fair value 117,193 111,311
2024 Convertible Notes | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value 129,979 139,969
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 129,979 139,969
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 133,164 126,210
2025 Convertible Notes | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value 137,569 138,345
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 137,569 138,345
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% 8.50%
8.5% unsecured debt due 2024 | Carrying Value    
Financial liabilities:    
Debt instrument, fair value $ 872 $ 1,092
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value 872 1,092
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 1    
Financial liabilities:    
Debt instrument, fair value 0 0
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 2    
Financial liabilities:    
Debt instrument, fair value 0 0
8.5% unsecured debt due 2024 | Estimate of Fair Value Measurement | Level 3    
Financial liabilities:    
Debt instrument, fair value $ 872 1,092
CASHMAX secured borrowing facility | Carrying Value    
Financial liabilities:    
Debt instrument, fair value   634
CASHMAX secured borrowing facility | Estimate of Fair Value Measurement    
Financial liabilities:    
Debt instrument, fair value   634
CASHMAX secured borrowing facility | Estimate of Fair Value Measurement | Level 1    
Financial liabilities:    
Debt instrument, fair value   0
CASHMAX secured borrowing facility | Estimate of Fair Value Measurement | Level 2    
Financial liabilities:    
Debt instrument, fair value   0
CASHMAX secured borrowing facility | Estimate of Fair Value Measurement | Level 3    
Financial liabilities:    
Debt instrument, fair value   $ 634