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Other Employee Benefit Plans (Details)
12 Months Ended
Oct. 31, 2014
Defined Contribution Pension Plan Canada
CAD
Oct. 31, 2013
Defined Contribution Pension Plan Canada
CAD
Oct. 31, 2012
Defined Contribution Pension Plan Canada
CAD
Oct. 31, 2014
Defined Contribution Profit Sharing Plan
USD ($)
Oct. 31, 2013
Defined Contribution Profit Sharing Plan
USD ($)
Oct. 31, 2012
Defined Contribution Profit Sharing Plan
USD ($)
Schedule of Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]            
Maximum total employee and employer contribution percentage 18.00%cien_DefinedContributionPlanEmployerAndEmployeeCombinedMaximumAnnualContributionPerEmployeePercent
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
         
Maximum total employee and employer contribution amount 24,930cien_DefinedContributionPlanEmployerAndEmployeeCombinedMaximumAnnualContributionPerEmployeeAmount
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
         
Required employer contribution percent 1.00%cien_DefinedContributionPlanRequiredEmployerContributionPercent
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
         
Employer matching percentage for eligible employee contribution 50.00%cien_DefinedContributionPlanEmployerMatchingPercentOfEmployeeContribution
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
    50.00%cien_DefinedContributionPlanEmployerMatchingPercentOfEmployeeContribution
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember
   
Maximum employer annual contribution amount per employee 3,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
         
Employer matching contributions 4,100,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
3,900,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
4,000,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionPensionPlanCanadaMember
$ 4,500,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember
$ 4,000,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember
$ 4,100,000us-gaap_DefinedContributionPlanCostRecognized
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember
Maximum employee contribution percentage of pre-tax compensation       60.00%cien_DefinedContributionPlanMaximumEmployeeContributionPercentageOfCompensation
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember
   
Percentage of employee contribution with 50% employer matching contribution       6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ cien_DefinedContributionPensionAndOtherPostretirementPlansAxis
= cien_DefinedContributionProfitSharingPlanMember