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Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts (Details) - Foreign Exchange Forward - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 563,921 | $ 512,462
Canadian / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 4,894 | 6,847
Euro / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 387,466 | 390,673
Euro / U.S. Dollar | Designated as Hedging Instrument | Net Investment Hedging |  |
Derivative [Line Items] |  |
Notional amount | 128,103 | 164,885
British Pound / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 23,141 | 6,328
Israeli Shekel / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 10,475 | 9,503
Japanese Yen / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 46,450 | 50,379
Swiss Franc / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 18,039 | 12,874
Swedish Krona / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 34,196 | 18,871
Singapore Dollar / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 3,498 | 3,281
Chinese Renminbi / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 23,297 | 5,415
New Taiwan Dollar / U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 3,369 | 1,483
Russian Ruble/ U.S. Dollar | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 2,614 | 309
All other | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 6,482 | $ 6,499

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