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Interest and Other Income (Loss), Net
 3 Months Ended
Jan. 31, 2018
Other Income and Expenses [Abstract]  
Interest and Other Income (Loss), Net
INTEREST AND OTHER INCOME (LOSS), NET
The components of interest and other income (loss), net, are as follows (in thousands):
 
Quarter Ended January 31,
 
2018
 
2017
Interest income
$
2,444

 
$
1,282

Gains (losses) on non-hedge designated foreign currency forward contracts
(699
)
 
1,024

Foreign currency exchange gain (loss)
13

 
(2,417
)
Other
(183
)
 
481

Interest and other income (loss), net
$
1,575

 
$
370


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. During the first three months of fiscal 2017, Ciena recorded $2.4 million in foreign currency exchange rate losses 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 these balance sheet exposures. 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 three months of fiscal 2018, Ciena recorded losses of $0.7 million from non-hedge designated foreign currency forward contracts. During the first three months of fiscal 2017, Ciena recorded gains of $1.0 million from non-hedge designated foreign currency forward contracts.