Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Financial assets:
Cash equivalents	$ 108,064	$ 114,375
Convertible note	2,000	2,000
Forward contracts	1,646	5,363
Equity securities		77,540
Options	2,322
Financial assets, fair value	114,032	199,278
Financial liabilities:
Forward contracts	2,637	3,318
Financial liabilities, fair value	2,637	3,318
Level 1
Financial assets:
Cash equivalents	108,064	114,375
Convertible note	0	0
Forward contracts	0	0
Equity securities		0
Options	0
Financial assets, fair value	108,064	114,375
Financial liabilities:
Forward contracts	0	0
Financial liabilities, fair value	0	0
Level 2
Financial assets:
Cash equivalents	0	0
Convertible note	0	0
Forward contracts	1,646	5,363
Equity securities		0
Options	2,322
Financial assets, fair value	3,968	5,363
Financial liabilities:
Forward contracts	2,637	3,318
Financial liabilities, fair value	2,637	3,318
Level 3
Financial assets:
Cash equivalents	0	0
Convertible note	2,000	2,000
Forward contracts	0	0
Equity securities		77,540
Options	0
Financial assets, fair value	2,000	79,540
Financial liabilities:
Forward contracts	0	0
Financial liabilities, fair value	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of the entity's equity.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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