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Interest and Other Income (Loss), Net
 9 Months Ended
Jul. 31, 2019
Other Income and Expenses [Abstract]  
Interest and Other Income (Loss), Net INTEREST AND OTHER INCOME (LOSS), NET
The components of interest and other income, net, are as follows (in thousands):
 
Quarter Ended July 31,
 
Nine Months Ended July 31,
 
2019
 
2018
 
2019
 
2018
Interest income
$
3,475

 
$
3,620

 
$
10,866

 
$
9,276

Gains (losses) on non-hedge designated foreign currency forward contracts
119

 
2,182

 
(757
)
 
4,351

Foreign currency exchange losses
(2,373
)
 
(6,879
)
 
(4,585
)
 
(11,670
)
Other
(171
)
 
(466
)
 
(465
)
 
(629
)
Interest and other income (loss), net
$
1,050

 
$
(1,543
)
 
$
5,059

 
$
1,328


Ciena Corporation, as the U.S. parent entity, uses the U.S. Dollar as its functional currency; however, some of its foreign branch offices and subsidiaries use local currencies as their functional currencies. Ciena recorded $4.6 million and $11.7 million in foreign currency exchange rate losses during the first nine months of fiscal 2019 and fiscal 2018, respectively, as a result of monetary assets and liabilities that were transacted in a currency other than the entity’s functional currency, and the remeasurement adjustments were recorded in interest and other income (loss), net on the Condensed Consolidated Statements of Operations. From time to time, Ciena uses foreign currency forwards to hedge this type of balance sheet exposure. These forwards are not designated as hedges for accounting purposes, and any net gain or loss associated with these derivatives is reported in interest and other income (loss), net on the Condensed Consolidated Statements of Operations. During the first nine months of fiscal 2019, Ciena recorded losses of $0.8 million from non-hedge designated foreign currency forward contracts. During the first nine months of fiscal 2018, Ciena recorded gains of $4.4 million from non-hedge designated foreign currency forward contracts.