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Equity Transactions - Fair Value (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Stock options      
Fair value assumptions      
Dividend yield 0.00% 0.00% 0.00%
Expected volatility, minimum 51.00% 46.50% 47.80%
Expected volatility, maximum 55.90% 51.00% 53.70%
Risk free interest rate, minimum 0.40% 0.50% 1.90%
Risk free interest rate, maximum 0.80% 1.50% 2.80%
Expected term   7 years 4 months 24 days 7 years 1 month 6 days
Stock options | Minimum      
Fair value assumptions      
Expected term 4 years 7 months 6 days 4 years 7 months 6 days  
Stock options | Maximum      
Fair value assumptions      
Expected term 7 years 7 months 6 days    
Stock appreciation rights      
Fair value assumptions      
Dividend yield 0.00% 0.00% 0.00%
Expected volatility, minimum 78.30% 55.00% 38.20%
Expected volatility, maximum 78.30% 68.80% 48.80%
Risk free interest rate, minimum 0.10% 0.10% 1.30%
Risk free interest rate, maximum 0.10% 0.10% 1.70%
Stock appreciation rights | Minimum      
Fair value assumptions      
Expected term 1 year 3 months 18 days 0 years 1 month 6 days
Stock appreciation rights | Maximum      
Fair value assumptions      
Expected term 1 year 3 months 18 days 2 years 3 months 18 days 3 years 3 months 18 days
Stock options, RSUs and SARS, market based      
Fair value assumptions      
Dividend yield 0.00% 0.00% 0.00%
Expected volatility, minimum 51.60% 45.20% 45.50%
Expected volatility, maximum 54.60% 54.90% 55.00%
Risk free interest rate, minimum 0.30% 0.10% 1.50%
Risk free interest rate, maximum 0.90% 1.70% 2.90%
Stock options, RSUs and SARS, market based | Minimum      
Fair value assumptions      
Expected holding period 31.70% 30.70% 25.90%
Stock options, RSUs and SARS, market based | Maximum      
Fair value assumptions      
Expected holding period 100.00% 100.00% 100.00%