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Derivative Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Notional Amounts of Derivative Instruments | The table below presents the total volume or notional amounts of the Company’s derivative instruments as of September 30, 2019. Notional values are in U.S. dollars and are translated and calculated based on forward rates as of September 30, 2019 for forward contracts, and based on spot rates as of September 30, 2019 for options.
|  | Notional Value* |
Foreign exchange contracts |  | $ | 1,103,169 |
(*) | Gross notional amounts do not quantify risk or represent assets or liabilities of the Company but are used in the calculation of settlements under the contracts.
Fair Value of Open Foreign Currency Exchange Contracts | The fair value of the open foreign exchange contracts recorded as an asset or a liability by the Company on its consolidated balance sheets as of September 30, 2019 and September 30, 2018, is as follows:
|  | As of September 30, |
|  | 2019 |  |  | 2018 |
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  | $ | 9,344 |  |  | $ | 221 |
Other noncurrent assets |  |  | 585 |  |  |  | 25 |
Accrued expenses and other current liabilities |  |  | (2,977 | ) |  |  | (17,681 | )
Other noncurrent liabilities |  |  | (2,072 | ) |  |  | (10,030 | )
|  |  | 4,880 |  |  |  | (27,465 | )
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | 5,086 |  |  |  | 2,758 |
Accrued expenses and other current liabilities |  |  | (2,076 | ) |  |  | (3,135 | )
|  |  | 3,010 |  |  |  | (377 | )
Net fair value |  | $ | 7,890 |  |  | $ | (27,842 | )
Effect of Cash Flow Hedging Instruments | The effect of the Company’s cash flow hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2019, 2018 and 2017, respectively, which partially offsets the foreign currency impact from the underlying exposures, is summarized as follows:
|  | (Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion) Year Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Line item in consolidated statements of income: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 19 |  |  | $ | (1,129 | ) |  | $ | (1,021 | )
Cost of revenue |  |  | (8,627 | ) |  |  | 15,877 |  |  |  | 21,783 |
Research and development |  |  | (2,059 | ) |  |  | 3,127 |  |  |  | 4,282 |
Selling, general and administrative |  |  | (2,309 | ) |  |  | 3,462 |  |  |  | 3,305 |
Total |  | $ | (12,976 | ) |  | $ | 21,337 |  |  | $ | 28,349 |
Changes in Net Unrealized (Losses) Gains on Cash Flow Hedges | The activity related to the changes in net unrealized gains (losses) on cash flow hedges recorded in accumulated other comprehensive (loss) income, net of tax, is as follows:
|  | Year Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Net unrealized (loss) gain on cash flow hedges, net of tax, beginning of period |  | $ | (26,608 | ) |  | $ | 24,508 |  |  | $ | 12,514 |
Changes in fair value of cash flow hedges, net of tax |  |  | 19,228 |  |  |  | (31,908 | ) |  |  | 36,765 |
Reclassification of loss (gain) into earnings, net of tax |  |  | 11,325 |  |  |  | (19,208 | ) |  |  | (24,771 | )
Net unrealized gain (loss) on cash flow hedges, net of tax, end of period |  | $ | 3,945 |  |  | $ | (26,608 | ) |  | $ | 24,508 |
Effect of Non-Designated as Hedging Instruments | The effect of the Company’s derivative instruments not designated as hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2019, 2018 and 2017, respectively, which partially offsets the foreign currency impact from the underlying exposure, is summarized as follows:
|  | Gains (Losses) Recognized in Income Year Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Line item in statements of income: |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 401 |  |  | $ | (4,577 | ) |  | $ | 4,639 |
Research and development |  |  | 14 |  |  |  | (736 | ) |  |  | 957 |
Selling, general and administrative |  |  | 294 |  |  |  | (950 | ) |  |  | 1,723 |
Interest and other income (expense), net |  |  | 5,845 |  |  |  | 7,038 |  |  |  | (10,514 | )
Income taxes |  |  | (528 | ) |  |  | 1,581 |  |  |  | (1,653 | )
Total |  | $ | 6,026 |  |  | $ | 2,356 |  |  | $ | (4,848 | )

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