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Derivative Instruments and Hedging Activities (Tables) | 6 Months Ended
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Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Information regarding derivative instruments not designated as hedging instruments | The following tables set forth certain information regarding our derivative instruments not designated as hedging instruments:
|  |  |  | Fair Value Asset (Liability) of Derivative Instruments
Derivative Instrument |  | Balance Sheet Location |  | March 31, 2016 |  | March 31, 2015 |  | September 30, 2015
|  |  |  | (in thousands)
Foreign currency forwards |  | Prepaid expenses and other current assets |  | $ | 7,694 |  |  | $ | 2,530 |  |  | $ | 14,169 |
Cash Convertible Notes Hedges |  | Other assets, net |  | 3,219 |  |  | 27,215 |  |  | 10,505 |
Cash Convertible Notes Embedded Derivative |  | Long-term debt, less current maturities |  | (3,219 | ) |  | (27,215 | ) |  | (10,505 | )
|  |  |  | Amount of Unrealized Gain (Loss) on Derivatives
|  |  |  | Three Months Ended March 31, |  | Six Months Ended March 31,
Derivative Instrument |  | Income Statement Location |  | 2016 |  | 2015 |  | 2016 |  | 2015
|  |  |  | (in thousands)
Foreign currency forwards |  | Other expense* |  | $ | (1,805 | ) |  | $ | 784 |  |  | $ | (2,918 | ) |  | $ | 7,798 |
*Amount is partially offset by gains and losses caused by related foreign currency fluctuations.

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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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