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Equipment, Furniture and Fixtures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Oct. 31, 2014
Property, Plant and Equipment, Net [Abstract]      
Equipment, furniture and fixtures, gross $ 418,122us-gaap_PropertyPlantAndEquipmentGross   $ 429,413us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (298,719)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (302,781)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Equipment, furniture and fixtures, net 119,403us-gaap_PropertyPlantAndEquipmentNet   126,632us-gaap_PropertyPlantAndEquipmentNet
Equipment, furniture and fixtures (Textuals) [Abstract]      
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements 13,772cien_DepreciationAndAmortizationOfIntangibleAssetsIncludedInPropertyPlantAndEquipment 13,328cien_DepreciationAndAmortizationOfIntangibleAssetsIncludedInPropertyPlantAndEquipment  
Equipment Furniture Fixtures And Leasehold Improvements [Member]      
Equipment, furniture and fixtures (Textuals) [Abstract]      
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements 11,300cien_DepreciationAndAmortizationOfIntangibleAssetsIncludedInPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
11,400cien_DepreciationAndAmortizationOfIntangibleAssetsIncludedInPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureFixturesAndLeaseholdImprovementsMember
 
Equipment, Furniture and Fixtures      
Property, Plant and Equipment, Net [Abstract]      
Equipment, furniture and fixtures, gross 372,153us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureAndFixturesMember
  383,059us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cien_EquipmentFurnitureAndFixturesMember
Leasehold Improvements      
Property, Plant and Equipment, Net [Abstract]      
Equipment, furniture and fixtures, gross $ 45,969us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
  $ 46,354us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember