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Description of Business - Narrative (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 05, 2020
Access Industries |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of stock, percentage of ownership after transaction (as a percent) | 98.00% |  |
Sale of stock, percentage of economic interest (as a percent) | 73.00% |  |
Class A Common Stock |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
Class A Common Stock | IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001
Common Class B |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (in dollars per share) | 0.001 | $ 0.001 |
Common Class B | Access Industries |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |

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