Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts and Options (Details) - Not Designated as Hedging Instrument - Foreign Exchange Forward Contract and Options - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Notional amount	$ 675,152	$ 512,462
Canadian / U.S. Dollar
Derivative [Line Items]
Notional amount	6,502	6,847
Euro / U.S. Dollar
Derivative [Line Items]
Notional amount	588,549	390,673
British Pound / U.S. Dollar
Derivative [Line Items]
Notional amount	2,349	6,328
Israeli Shekel / U.S. Dollar
Derivative [Line Items]
Notional amount	10,308	9,503
Japanese Yen / U.S. Dollar
Derivative [Line Items]
Notional amount	10,061	50,379
Swiss Franc / U.S. Dollar
Derivative [Line Items]
Notional amount	2,903	12,874
Danish Krone / U.S. Dollar
Derivative [Line Items]
Notional amount	6,699	2,089
Swedish Krona / U.S. Dollar
Derivative [Line Items]
Notional amount	18,736	18,871
Chinese Renminbi / U.S. Dollar
Derivative [Line Items]
Notional amount	8,518	5,415
South Korean Won / U.S. Dollar
Derivative [Line Items]
Notional amount	8,523	0
All other
Derivative [Line Items]
Notional amount	$ 12,004	$ 9,483