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INTEREST AND OTHER INCOME (LOSS), NET
 6 Months Ended
Apr. 30, 2016
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 April 30,
 
Six Months Ended April 30,
 
2016
 
2015
 
2016
 
2015
Interest income
$
982

 
$
246

 
$
1,668

 
$
465

Gain (loss) on non-hedge designated foreign currency forward contracts
(10,600
)
 
14,351

 
(15,213
)
 
10,002

Foreign currency exchange gain (loss)
10,506

 
(18,832
)
 
6,130

 
(22,485
)
Other
79

 
(1,314
)
 
(394
)
 
(1,764
)
Interest and other income (loss), net
$
967

 
$
(5,549
)
 
$
(7,809
)
 
$
(13,782
)

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 the local currency as their functional currency. During the first six months of fiscal 2016 and the first six months of fiscal 2015, Ciena recorded $6.1 million of foreign currency exchange rate gains and $22.5 million in foreign currency exchange rate losses, respectively, as a result of monetary assets and liabilities that were transacted in a currency other than the entity's functional currency, and the re-measurement adjustments were recorded in interest and other income (loss), net on the Condensed Consolidated Statement 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 Statement of Operations. During the first six months of fiscal 2016 and fiscal 2015, Ciena recorded losses of $15.2 million and gains of $10.0 million, respectively, from non-hedge designated foreign currency forward contracts.