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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