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Equipment, Furniture and Fixtures (Details) (USD $)
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Property, Plant and Equipment, Net [Abstract]      
Property, Plant and Equipment, Gross $ 429,413,000us-gaap_PropertyPlantAndEquipmentGross $ 410,821,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation and amortization (302,781,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (291,092,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and Equipment, Net 126,632,000us-gaap_PropertyPlantAndEquipmentNet 119,729,000us-gaap_PropertyPlantAndEquipmentNet 123,580,000us-gaap_PropertyPlantAndEquipmentNet
Equipment Furniture Fixtures And Leasehold Improvements [Member]      
Equipment, furniture and fixtures (Textuals) [Abstract]      
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements 46,600,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
48,300,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
51,300,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
Equipment, furniture and fixtures      
Property, Plant and Equipment, Net [Abstract]      
Property, Plant and Equipment, Gross 383,059,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureAndFixturesMember
364,574,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureAndFixturesMember
 
Leasehold improvements      
Property, Plant and Equipment, Net [Abstract]      
Property, Plant and Equipment, Gross $ 46,354,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 46,247,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember