Commitments and Contingencies - Additional Information (Details) $ in Millions	6 Months Ended
	Mar. 31, 2022 USD ($) Plantiff	Mar. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Letters of credit and bank guarantees outstanding	$ 15.2	$ 16.3
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 sought unspecified damages on behalf of a class of Plan participants from September 17, 2014 through the date of any judgment.