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Summary of Significant Accounting Policies and Estimates - Cash Restrictions (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |
Restricted cash | $ 75,093 | $ 1,240 | $ 1,244
Restricted cash included in “Other non-current assets” | 10,000 |  | 0
Total restricted cash | 85,093 |  | 1,244
Credit Card Program Collateral |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Restricted cash | 1,410 |  | 923
Outstanding Bank Guarantee Collateral |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Restricted cash | 73,683 |  | 321
Surety Program Collateral |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Restricted cash included in “Other non-current assets” | $ 10,000 |  | $ 0

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