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Derivative Financial Instruments Derivative Financial Instruments (Derivative Instruments at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Derivatives, Fair Value [Line Items] |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value |  | $ 216
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value |  | 1,693
Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | $ 540 | 44
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 623 |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 2,352 | $ 1,477
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 1,995 |
Foreign Exchange Forward [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | 1,128 |
Foreign Exchange Forward [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value | 35 |
Foreign Exchange Forward [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 4,329 |
Foreign Exchange Forward [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | $ 18 |

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