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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, 2016 | Sep. 30, 2015
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Derivative [Line Items] |  |
Derivative, Notional Amount | $ 249,534 | $ 157,255
Canadian/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 14,685 | 17,448
Euro/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 174,120 | 82,917
British Pound/Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,382 | 9,409
Israeli Sheqel/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 7,271 | 4,607
Japanese Yen to Euro [Domain] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 32,782 | 25,133
Japanese Yen to USD [Domain] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 6,716 | 0
Swiss Franc/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 730 | 5,149
All other |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 11,848 | 12,592
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 39,059 | 0
Designated as Hedging Instrument [Member] | Euro/U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 26,181 | 0
Designated as Hedging Instrument [Member] | Japanese Yen/Euro |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 8,800 | 0
Designated as Hedging Instrument [Member] | SEK / U.S. Dollar |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 4,078 | $ 0

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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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