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Financial Assets and Liabilities (Tables) | 9 Months Ended
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Jul. 31, 2018
Financial Assets And Liabilities [Abstract] |
Summary of Available-for-Sale Securities | As of July 31, 2018, the balances of our cash equivalents are:
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses Less Than 12 Continuous Months |  | Gross Unrealized Losses 12 Continuous Months or Longer |  | Estimated Fair Value(1)
| (in thousands)
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 70,217 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 70,217 |
Total: | $ | 70,217 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 70,217 |
(1) | See Note 6. Fair Value Measures for further discussion on fair values of cash equivalents.
As of October 31, 2017, the balances of our cash equivalents are:
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses Less Than 12 Continuous Months |  | Gross Unrealized Losses 12 Continuous Months or Longer |  | Estimated Fair Value(1)
| (in thousands)
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 560,594 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 560,594 |
Total: | $ | 560,594 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 560,594 |
(1) | See Note 6. Fair Value Measures for further discussion on fair values of cash equivalents.
Effects on Changes in Fair Values of Non-Designated Forward Contracts | The effects of the changes in the fair values of non-designated forward contracts are summarized as follows:
| Three Months Ended July 31, |  | Nine Months Ended July 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Gain (loss) recorded in other income (expense), net | $ | 1,567 |  |  | $ | 515 |  |  | $ | 1,244 |  |  | $ | 1,838 |
Notional Amounts of Derivative Instruments | The notional amounts in the table below for derivative instruments provide one measure of the transaction volume outstanding:
| As of July 31, 2018 |  | As of October 31, 2017
| (in thousands)
Total gross notional amount | $ | 902,267 |  |  | $ | 955,139 |
Net fair value | $ | (9,202 | ) |  | $ | 14,052 |
Fair Values of Derivative Instrument Designated and Non-Designated as Hedging Instruments in Balance Sheet | The following represents the unaudited condensed consolidated balance sheet location and amount of derivative instrument fair values segregated between designated and non-designated hedge instruments:
| Fair values of derivative instruments designated as hedging instruments |  | Fair values of derivative instruments not designated as hedging instruments
| (in thousands)
As of July 31, 2018 |  |  |
Other current assets | $ | 3,872 |  |  | $ | 9 |
Accrued liabilities | $ | 12,962 |  |  | $ | 121 |
As of October 31, 2017 |  |  |
Other current assets | $ | 16,582 |  |  | $ | 15 |
Accrued liabilities | $ | 2,485 |  |  | $ | 59 |
Income Statement Location and Amount of Gains and Losses on Derivative Instrument Fair Values for Designated Hedge Instruments, Net of Tax | The following table represents the unaudited condensed consolidated statement of operations location and amount of gains and losses on derivative instrument fair values for designated hedge instruments, net of tax:
| Location of gain (loss) recognized in OCI on derivatives |  | Amount of gain (loss) recognized in OCI on derivatives (effective portion) |  | Location of gain (loss) reclassified from OCI |  | Amount of gain (loss) reclassified from OCI (effective portion)
| (in thousands)
Three months ended July 31, 2018 |  |  |  |  |  |  |
Foreign exchange contracts | Revenue |  | $ | 1,422 |  |  | Revenue |  | $ | (308 | )
Foreign exchange contracts | Operating expenses |  | (13,793 | ) |  | Operating expenses |  | 1,970 |
Total |  |  | $ | (12,371 | ) |  |  |  | $ | 1,662 |
Three months ended July 31, 2017 |  |  |  |  |  |  |
Foreign exchange contracts | Revenue |  | $ | (176 | ) |  | Revenue |  | $ | (198 | )
Foreign exchange contracts | Operating expenses |  | 8,747 |  |  | Operating expenses |  | 176 |
Total |  |  | $ | 8,571 |  |  |  |  | $ | (22 | )
Nine months ended July 31, 2018 |  |  |  |  |  |  |
Foreign exchange contracts | Revenue |  | $ | (542 | ) |  | Revenue |  | $ | 1,190 |
Foreign exchange contracts | Operating expenses |  | (7,349 | ) |  | Operating expenses |  | 11,320 |
Total |  |  | $ | (7,891 | ) |  |  |  | $ | 12,510 |
Nine months ended July 31, 2017 |  |  |  |  |  |  |
Foreign exchange contracts | Revenue |  | $ | 6,824 |  |  | Revenue |  | $ | (2,379 | )
Foreign exchange contracts | Operating expenses |  | 12,357 |  |  | Operating expenses |  | (3,236 | )
Total |  |  | $ | 19,181 |  |  |  |  | $ | (5,615 | )
Ineffective Portion and Portion Excluded from Effectiveness Testing of Derivative Hedge Gains (Losses) | The following table represents the ineffective portions and portions excluded from effectiveness testing of the hedge gains (losses) for derivative instruments designated as hedging instruments, which are recorded in other income (expense), net:
Foreign exchange contracts | Amount of gain (loss) recognized in statement of operations on derivatives (ineffective portion)(1) |  | Amount of gain (loss) recognized in statement of operations on derivatives (excluded from effectiveness testing)(2)
| (in thousands)
For the three months ended July 31, 2018 | $ | (132 | ) |  | $ | 782 |
For the three months ended July 31, 2017 | $ | 11 |  |  | $ | 776 |
For the nine months ended July 31, 2018 | $ | 389 |  |  | $ | 2,488 |
For the nine months ended July 31, 2017 | $ | 175 |  |  | $ | 3,393 |
(1) | The ineffective portion includes forecast inaccuracies.
(2) | The portion excluded from effectiveness testing includes the discount earned or premium paid for the contracts.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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