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Stock-based Compensation and Equity Grants - Narrative (Details) - Employee Stock Option
9 Months Ended
Jun. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of awards authorized for issuance (in shares) 0
Expiration term of share-based compensation plan 10 years
Number of shares available for grant (in shares) 1,900,000