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Commitments and Contingencies - Operating Lease Commitments (Details) (USD $)
12 Months Ended 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2014
sqft
Future annual minimum rental commitments under non-cancelable operating leases:        
2015 $ 33,527,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent     $ 33,527,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 31,605,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears     31,605,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 28,232,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears     28,232,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 15,675,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears     15,675,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 12,668,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears     12,668,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 83,191,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter     83,191,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total 204,898,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue     204,898,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating lease, rental expense        
Future minimal rental commitments 204,898,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue     204,898,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Rental expense 22,900,000us-gaap_LeaseAndRentalExpense 26,000,000us-gaap_LeaseAndRentalExpense 21,700,000us-gaap_LeaseAndRentalExpense  
Building        
Future annual minimum rental commitments under non-cancelable operating leases:        
Total 49,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
    49,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Operating lease, rental expense        
Rentable area (in square feet) 170,582us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
    170,582us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Term of contract       18 years
Future minimal rental commitments 49,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
    49,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Restructured Facilities and Unfavorable Lease        
Operating lease, rental expense        
Rental expense $ 500,000us-gaap_LeaseAndRentalExpense
/ us-gaap_RestructuringCostAndReserveAxis
= cien_RestructuredFacilitiesAndUnfavorableLeaseMember
$ 1,600,000us-gaap_LeaseAndRentalExpense
/ us-gaap_RestructuringCostAndReserveAxis
= cien_RestructuredFacilitiesAndUnfavorableLeaseMember
$ 1,400,000us-gaap_LeaseAndRentalExpense
/ us-gaap_RestructuringCostAndReserveAxis
= cien_RestructuredFacilitiesAndUnfavorableLeaseMember