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Interest and Other Income (Loss), Net
 9 Months Ended
Jul. 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 July 31,
 
Nine Months Ended July 31,
 
2018
 
2017
 
2018
 
2017
Interest income
$
3,620

 
$
1,820

 
$
9,276

 
$
4,609

Gains (losses) on non-hedge designated foreign currency forward contracts
2,182

 
834

 
4,351

 
(891
)
Foreign currency exchange loss
(6,879
)
 
(2,946
)
 
(11,670
)
 
(4,071
)
Modification of term loan
—

 
—

 
—

 
(2,924
)
Other
(466
)
 
(556
)
 
(629
)
 
(119
)
Interest and other income (loss), net
$
(1,543
)
 
$
(848
)
 
$
1,328

 
$
(3,396
)

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 $11.7 million and $4.1 million in foreign currency exchange rate losses during the first nine months of fiscal 2018 and fiscal 2017, 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. For the first nine months of fiscal 2018, the majority of the foreign currency exchange rate losses relate to Ciena’s Argentinian and Brazilian subsidiaries owing U.S. Dollars to Ciena Corporation. 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 2018, Ciena recorded gains of $4.4 million from non-hedge designated foreign currency forward contracts. During the first nine months of fiscal 2017, Ciena recorded losses of $0.9 million from non-hedge designated foreign currency forward contracts.