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Share-based Compensation (Weighted Average Assumptions for Options Granted) (Details) - Stock Option [Member] - $ / shares
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 78.53% 68.88% 63.13%
Expected dividend yield 0.00% 0.00% 0.00%
Risk-free interest rate 1.10% 0.64% 1.63%
Expected term (in years) 6 years 5 years 10 months 24 days 5 years 10 months 24 days
Fair value of options granted $ 5.98 $ 3.46 $ 1.14