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Convertible Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value $ 1,217,863us-gaap_ConvertibleNotesPayable
Fair Value 1,331,220us-gaap_ConvertibleDebtFairValueDisclosures [1]
3.75% Convertible Senior Notes due October 15, 2018  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 350,000us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member
Fair Value 416,063us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member
[1]
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_ThreePointSevenFivePercentConvertibleSeniorNotesDue2018Member
4.0% Convertible Senior Notes due March 15, 2015  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 187,520us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member
[2]
Fair Value 191,016us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member
[1],[2]
Debt Instrument, Interest Rate, Stated Percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2015Member
0.875% Convertible Senior Notes due June 15, 2017  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 500,000us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member
Fair Value 495,625us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member
[1]
Debt Instrument, Interest Rate, Stated Percentage 0.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_PointEightSevenFivePercentConvertibleSeniorNotesDue2017Member
4.0% Convertible Senior Notes due December 15, 2020  
Carrying value and estimated current fair value of outstanding convertible notes  
Carrying value 180,343us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member
[3]
Fair Value $ 228,516us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member
[1],[3]
Debt Instrument, Interest Rate, Stated Percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cien_FourPercentConvertibleSeniorNotesDue2020Member
[1] The convertible notes were categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its outstanding convertible notes using a market approach based upon observable inputs, such as current market transactions involving comparable securities.
[2] Includes unamortized bond premium related to embedded redemption feature.
[3] Includes unamortized discount and accretion of principal.