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Derivative Financial Instruments - Schedule of Derivative Instruments and Hedging Activities Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Designated as Hedging Instrument
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in OCI—effective portion			$ 200
Foreign Exchange Forward | Not Designated as Hedging Instrument | Other Income
Derivative Instruments Gain Loss [Line Items]
Net realized and unrealized gain (loss), excluding the underlying foreign currency exposure being hedged	$ (3,758)	$ 3,518	(11,314)
Foreign Exchange Forward | Designated as Hedging Instrument | Net Investment Hedging
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in OCI—effective portion	695	(5,483)	(2,925)
Gain (loss) reclassified from OCI—effective portion	2,723	109	(7,630)
Foreign Exchange Forward | Designated as Hedging Instrument | Other Income | Net Investment Hedging
Derivative Instruments Gain Loss [Line Items]
Gain recognized—portion excluded from effectiveness testing	$ 1,249	$ 3,506	$ 4,598

X

- Definition

Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 45
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

+ References

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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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