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Segment and Entity Wide Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Ciena's geographic distribution of revenue
Revenue	$ 1,741,970	$ 1,236,636	$ 652,629
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	122,558	120,294	61,868
United States [Member]
Ciena's geographic distribution of revenue
Revenue	930,880	744,232	419,405
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	60,848	63,675	47,875
United Kingdom [Member]
Ciena's geographic distribution of revenue
Revenue			81,784
Canada [Member]
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	47,424	45,103
Other International [Member]
Ciena's geographic distribution of revenue
Revenue	811,090	492,404	151,440
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, furniture and fixtures, net	$ 14,286	$ 11,516	$ 13,993

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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