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Segments and Entity Wide Disclosures (Details 2) (Customer Concentration Risk, Sales Revenue, Goods, Net, ATT, USD $)
In Millions, unless otherwise specified
3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Customer Concentration Risk | Sales Revenue, Goods, Net | ATT
   
Revenue, Major Customer [Line Items]    
Revenue $ 116.6us-gaap_Revenues
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cien_AttMember
$ 100.5us-gaap_Revenues
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= cien_AttMember