Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
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| Contract With Customer Liability [Roll Forward] | ||
| Balance, beginning of period | $ 3,973 | $ 3,328 |
| Additions | 50,301 | 23,792 |
| Revenue recognized | (49,620) | (23,147) |
| Balance, end of period | $ 4,654 | $ 3,973 |
| X | ||||||||||
- Definition Contract with Customer, Liability, Increase For Current Activity No definition available.
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| X | ||||||||||
- Definition Contract With Customer, Liability, Revenue Deferred And Recognized During Period No definition available.
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| X | ||||||||||
- Definition Contract With Customer Liability No definition available.
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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