Stock-based compensation expense - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | $ 79,033 | $ 36,998 | $ 17,096 |
| Cost of revenues | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | 4,587 | 2,678 | 1,290 |
| Research and development | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | 19,541 | 10,166 | 3,346 |
| Selling, general and administrative | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | $ 54,905 | $ 24,154 | $ 12,460 |