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Derivative Financial Instruments Derivative Financial Instruments (Notional Amounts of Outstanding Forward Contracts (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Derivative [Line Items] |  |
Derivative, Notional Amount | $ 318,519 | $ 249,534
Canadian/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 12,809 | 14,685
Euro/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 244,000 | 174,120
Israeli Sheqel/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 8,820 | 7,271
Japanese Yen/Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 17,694 | 32,782
Japanese Yen/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 3,198 | 6,716
Swiss Franc / Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 7,157 | 0
SEK / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 4,627 | 3,852
Chinese Yuan offshore / Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 10,423 | 0
Singapore Dollar / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,186 | 1,448
All other |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 8,605 | 8,660
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 101,597 | 39,059
Designated as Hedging Instrument [Member] | Euro/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 64,831 | 26,181
Designated as Hedging Instrument [Member] | Japanese Yen/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 22,675 | 8,800
Designated as Hedging Instrument [Member] | SEK / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 14,091 | $ 4,078

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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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