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Financial Assets and Liabilities (Tables)
 9 Months Ended
Jul. 31, 2019
Financial Assets And Liabilities [Abstract]  
Summary of Available-for-Sale Securities
As of July 31, 2019, the balances of the Company's 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
$
130,437

 
$
—

 
$
—

 
$
—

 
$
130,437

Total:
$
130,437

 
$
—

 
$
—

 
$
—

 
$
130,437

(1)
See Note 5. Fair Value Measures for further discussion on fair values of cash equivalents.
As of October 31, 2018, the balances of the Company's 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
$
165,296

 
$
—

 
$
—

 
$
—

 
$
165,296

Total:
$
165,296

 
$
—

 
$
—

 
$
—

 
$
165,296

(1)
See Note 5. Fair Value Measures for further discussion on fair values of cash equivalents.
Schedule of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash included in the unaudited condensed consolidated balance sheets:
 
As of July 31, 2019
 
As of October 31, 2018
 
(in thousands)
Cash and cash equivalents
$
686,780

 
$
723,115

Restricted cash included in Prepaid expenses and other current assets
1,171

 
1,164

Restricted cash included in Other long-term assets
730

 
722

Total cash, cash equivalents and restricted cash
$
688,681

 
$
725,001
Effects on Changes in Fair Values of Non-Designated Forward Contracts
The effect of the changes in the fair values of non-designated forward contracts is summarized as follows:
 
Three Months Ended 
 July 31,
 
Nine Months Ended 
 July 31,
 
2019
 
2018
 
2019
 
2018
 
(in thousands)
Gain (loss) recorded in other income (expense), net
$
1,179

 
$
1,567

 
$
4,314

 
$
1,244
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, 2019
 
As of October 31, 2018
 
(in thousands)
Total gross notional amount
$
779,127

 
$
1,135,549

Net fair value
$
(565
)
 
$
(18,120
)
Fair Values of Derivative Instrument Designated and Non-Designated as Hedging Instruments in Balance Sheet
The following table 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, 2019
 
 
 
Other current assets
$
6,487

 
$
77

Accrued liabilities
$
7,020

 
$
109

As of October 31, 2018
 
 
 
Other current assets
$
4,771

 
$
131

Accrued liabilities
$
22,890

 
$
132
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, 2019
 
 
 
 
 
 
 
Foreign exchange contracts
Revenue
 
$
(994
)
 
Revenue
 
$
685

Foreign exchange contracts
Operating expenses
 
(76
)
 
Operating expenses
 
(3,945
)
Total
 
 
$
(1,070
)
 
 
 
$
(3,260
)
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

Nine months ended 
 July 31, 2019
 
 
 
 
 
 
 
Foreign exchange contracts
Revenue
 
$
(253
)
 
Revenue
 
$
1,048

Foreign exchange contracts
Operating expenses
 
5,097

 
Operating expenses
 
(12,795
)
Total
 
 
$
4,844

 
 
 
$
(11,747
)
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
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, 2019
$
232

 
$
1,077

For the three months ended July 31, 2018
$
(132
)
 
$
782

For the nine months ended July 31, 2019
$
148

 
$
358

For the nine months ended July 31, 2018
$
389

 
$
2,488

(1)
The ineffective portion includes forecast inaccuracies.
(2)
The portion excluded from effectiveness testing includes the discount earned or premium paid for the contracts.