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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 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 666,777 | $ 512,462
Canadian / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 5,696 | 6,847
Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 569,595 | 390,673
British Pound / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 7,525 | 6,328
Israeli Shekel / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 9,468 | 9,503
Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 29,174 | 50,379
Swiss Franc / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 8,969 | 12,874
Swedish Krona / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 9,189 | 18,871
Chinese Renminbi / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 11,698 | 5,415
Taiwanese Dollar / U.S. Dollar |  |
Derivative [Line Items] |  |
Notional amount | 4,195 | 1,482
All other |  |
Derivative [Line Items] |  |
Notional amount | $ 11,268 | $ 10,090

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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