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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 | Mar. 31, 2021 | Sep. 30, 2020
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Derivative [Line Items] |  |
Notional amount | $ 622,286 | $ 512,462
Canadian / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 5,824 | 6,847
Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 532,906 | 390,673
British Pound / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 1,459 | 6,328
Israeli Shekel / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 10,115 | 9,503
Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 10,186 | 50,379
Swiss Franc / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 2,327 | 12,874
Swedish Krona / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 25,564 | 18,871
Chinese Renminbi / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 12,523 | 5,415
Taiwanese Dollar / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 7,876 | 1,482
All other |  |
Derivative [Line Items] |  |
Notional amount | $ 13,506 | $ 10,090

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