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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Net losses on foreign currency exposures	$ 8,000	$ 1,700	$ 3,200
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged)	(4,900)	7,000	(8,400)
Designated as Hedging Instrument
Derivative [Line Items]
Gain (loss) recognized in OCI—effective portion			200
Gain (loss) reclassified from OCI into income—effective portion			600
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging
Derivative [Line Items]
Gain (loss) recognized in OCI—effective portion	$ 695	$ (5,483)	$ (2,925)
Derivative, remaining maturity	3 months

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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