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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Oct. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Call Spread Option Ciena purchased a call spread option relating to the 2017 Notes for $42.5 million during the third quarter of fiscal 2007. The call spread option was designed to mitigate exposure to potential dilution from the conversion of the notes. The call spread option was purchased at the time of the notes offering from an affiliate of the underwriter. The cost of the call spread option was recorded as a reduction in paid-in capital. On June 15, 2017, the outstanding 0.875% Convertible Senior Notes matured and Ciena repaid the approximately $185.3 million in aggregate principal amount outstanding, together with approximately $0.8 million in accrued interest through the date of maturity. At this time, the call spread option relating to the 2017 Notes expired.