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Commitments and Contingencies - Litigation Contingencies (Details) (Graywire LLC)
0 Months Ended
Mar. 16, 2012
claim
May 29, 2008
defendant
Graywire LLC
   
Loss Contingencies [Line Items]    
Loss Contingency, Number of Defendants Other than Reporting Entity   4cien_LossContingencyNumberOfDefendantsOtherThanReportingEntity
/ us-gaap_LitigationCaseAxis
= cien_GraywireLlcMember
Loss Contingency, Claims Settled, Number 2us-gaap_LossContingencyClaimsSettledNumber
/ us-gaap_LitigationCaseAxis
= cien_GraywireLlcMember