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Commitments and Contingencies - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) Plantiff | Sep. 30, 2020 USD ($)
Loss Contingencies [Line Items] |  |
Letters of credit and bank guarantees outstanding | $ 16.3 | $ 16.4
Bank guarantees outstanding collateralized | $ 0.5 | $ 0.5
Putative Class Action |  |
Loss Contingencies [Line Items] |  |
Lawsuit filing date | September 17, 2020 |
Number of plaintiffs | Plantiff | 3 |
Lawsuit action domicile | U.S. District Court for the District of Massachusetts |
Plaintiffs claim | The plaintiffs seek unspecified damages on behalf of a class of Plan participants from September 17, 2014 through the date of any judgment. |

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