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Segment and Entity Wide Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Oct. 31, 2011
Ciena's geographic distribution of revenue
Revenue	$ 477,617	$ 417,894	$ 894,302	$ 851,202
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	115,773		115,773		122,558
United States [Member]
Ciena's geographic distribution of revenue
Revenue	252,668	230,801	485,746	451,150
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	54,043		54,043		60,848
Canada[Member]
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	50,058		50,058		47,424
Other International [Member]
Ciena's geographic distribution of revenue
Revenue	224,949	187,093	408,556	400,052
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	$ 11,672		$ 11,672		$ 14,286
Maximum [Member] \| Canada[Member]
Ciena's geographic distribution of revenue
Revenue, Net, Percentage				10.00%
Customer Concentration Risk [Member] \| Sales Revenue, Goods, Net [Member]
Ciena's geographic distribution of revenue
Revenue, Net, Percentage	10.00%	10.00%	10.00%	10.00%

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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