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Derivative Financial Instruments (Notional Amounts of Outstanding Forward Contracts (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 405,956 | $ 318,519
Not Designated as Hedging Instrument [Member] | Canadian / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 7,334 | 12,809
Not Designated as Hedging Instrument [Member] | Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 297,730 | 244,000
Not Designated as Hedging Instrument [Member] | British Pound / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 7,074 | 907
Not Designated as Hedging Instrument [Member] | Israeli Sheqel / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 9,778 | 8,820
Not Designated as Hedging Instrument [Member] | Japanese Yen / Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 17,694
Not Designated as Hedging Instrument [Member] | Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 37,456 | 3,198
Not Designated as Hedging Instrument [Member] | Swiss Franc / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 11,944 | 605
Not Designated as Hedging Instrument [Member] | Swiss Franc / Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 7,157
Not Designated as Hedging Instrument [Member] | SEK / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 18,207 | 4,627
Not Designated as Hedging Instrument [Member] | Chinese Yuan offshore / Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 10,423
Not Designated as Hedging Instrument [Member] | Singapore Dollar / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,314 | 1,186
Not Designated as Hedging Instrument [Member] | China, Yuan Renminbi |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 9,010 | 0
Not Designated as Hedging Instrument [Member] | All other |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 6,109 | 7,093
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 12,396 | 101,597
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Euro / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 8,495 | 64,831
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Japanese Yen / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 2,193 | 22,675
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | SEK / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,708 | $ 14,091

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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