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Derivative Financial Instruments (Derivative Instruments at Fair Value) (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | $ 440 | $ 540
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 2,449 | 623
Foreign Currency Cash Flow Hedge Liability at Fair Value | 0 | 2,352
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 3,419 | 1,995
Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | 2,889 | 1,128
Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | 0 | 35
Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 3,419 | 4,329
Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | $ 0 | $ 18

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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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