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Earnings (Loss) Per Share Calculation (Details 1)
In Thousands, unless otherwise specified
 3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 52,758us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 52,271us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
4.0% Convertible Senior Notes due March 15, 2015    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Interest rate on convertible notes 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member		  
0.875% Convertible Senior Notes due June 15, 2017    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Interest rate on convertible notes 0.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member		  
3.75% Convertible Senior Notes due October 15, 2018    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Interest rate on convertible notes 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member		  
4.0% Convertible Senior Notes due December 15, 2020    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Interest rate on convertible notes 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member		  
Shares Underlying Stock Options and Restricted Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 3,899us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= cien_SharesUnderlyingStockOptionsandRestrictedUnitsMember		 3,412us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= cien_SharesUnderlyingStockOptionsandRestrictedUnitsMember
Convertible Senior Notes | 4.0% Convertible Senior Notes due March 15, 2015    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 9,198us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member		 9,198us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member
Convertible Senior Notes | 0.875% Convertible Senior Notes due June 15, 2017    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 13,108us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member		 13,108us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member
Convertible Senior Notes | 3.75% Convertible Senior Notes due October 15, 2018    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 17,355us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member		 17,355us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member
Convertible Senior Notes | 4.0% Convertible Senior Notes due December 15, 2020    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total excluded due to anti-dilutive effect (in shares) 9,198us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member		 9,198us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member