Fair Value Measurements (Tables)

9 Months Ended

Jul. 31, 2014

Fair Value Disclosures [Abstract]

Summary of the fair value of assets recorded on a recurring basis

As of the date indicated, the following table summarizes the fair value of assets and liabilities that are recorded at fair value on a recurring basis (in thousands):

	July 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	390,006	$	—	$	—	$	390,006
U.S. government obligations	—		155,271		—		155,271
Commercial paper	—		79,993		—		79,993
Foreign currency forward contracts	—		849		—		849
Total assets measured at fair value	$	390,006	$	236,113	$	—	$	626,119
Liabilities:
Foreign currency forward contracts	$	—	$	390	$	—	$	390
Total liabilities measured at fair value	$	—	$	390	$	—	$	390

Assets are presented on Ciena's Condensed Consolidated Balance Sheet

As of the date indicated, the assets and liabilities above were presented on Ciena’s Condensed Consolidated Balance Sheet as follows (in thousands):

	July 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	390,006	$	49,995	$	—	$	440,001
Short-term investments	—		120,250		—		120,250
Prepaid expenses and other	—		849		—		849
Long-term investments	—		65,019		—		65,019
Total assets measured at fair value	$	390,006	$	236,113	$	—	$	626,119
Liabilities:
Accrued liabilities	$	—	$	390	$	—	$	390
Total liabilities measured at fair value	$	—	$	390	$	—	$	390

Reconciliation of changes in Level 3 fair value measurements

As of the dates indicated, the following table sets forth, in thousands, the reconciliation of changes in fair value measurements of Level 3 assets:

	Level 3
Balance at October 31, 2013	$	2,740
Issuances	—
Settlements	—
Changes in unrealized gain (loss)	(2,740		)
Transfers into Level 3	—
Transfers out of Level 3	—
Balance at July 31, 2014	$	—