Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Financial assets:
Cash equivalents	$ 58,772	$ 72,754
Convertible note	$ 2,000	$ 2,000
Derivative Asset Statement of Financial Position Extensible Enumeration	Other assets	Other assets
Financial assets, fair value	$ 62,245	$ 82,094
Financial liabilities:
Derivative Liability Statement Of Financial Position Extensible Enumeration	Other liabilities	Other liabilities
Financial liabilities, fair value	$ 5,584	$ 3,158
Forward Contracts
Financial assets:
Foreign currency contract, asset	1,473	7,340
Financial liabilities:
Foreign currency contracts, liability	5,584	3,158
Level 1
Financial assets:
Cash equivalents	58,772	72,754
Convertible note	0	0
Financial assets, fair value	58,772	72,754
Financial liabilities:
Financial liabilities, fair value	0	0
Level 1 | Forward Contracts
Financial assets:
Foreign currency contract, asset	0	0
Financial liabilities:
Foreign currency contracts, liability	0	0
Level 2
Financial assets:
Cash equivalents	0	0
Convertible note	0	0
Financial assets, fair value	1,473	7,340
Financial liabilities:
Financial liabilities, fair value	5,584	3,158
Level 2 | Forward Contracts
Financial assets:
Foreign currency contract, asset	1,473	7,340
Financial liabilities:
Foreign currency contracts, liability	5,584	3,158
Level 3
Financial assets:
Cash equivalents	0	0
Convertible note	2,000	2,000
Financial assets, fair value	2,000	2,000
Financial liabilities:
Financial liabilities, fair value	0	0
Level 3 | Forward Contracts
Financial assets:
Foreign currency contract, asset	0	0
Financial liabilities:
Foreign currency contracts, liability	$ 0	$ 0