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Other Employee Benefit Plans	12 Months Ended
Other Employee Benefit Plans	Oct. 31, 2019
Retirement Benefits [Abstract]
OTHER EMPLOYEE BENEFIT PLANS	OTHER EMPLOYEE BENEFIT PLANS Ciena has a Defined Contribution Pension Plan that covers a majority of its Canada-based employees. The plan covers all Canada-based employees who are not part of an excluded group. Total contributions (employee and employer) cannot exceed the lesser of 18% of participant earnings and an annual dollar limit (CAD$27,230 (approximately $20,725) for 2019). This plan includes a required employer contribution of 1% for all participants and a 50% matching of participant contributions up to a total annual maximum of CAD$3,000 (approximately $2,283) per employee. During fiscal 2019, 2018 and 2017, Ciena made matching contributions of approximately CAD$5.2 million (approximately $4.0 million), CAD$5.1 million (approximately $3.9 million) and CAD$4.7 million (approximately $3.6 million), respectively. Ciena has a 401(k) defined contribution profit sharing plan. Participants may contribute up to 60% of pre-tax compensation, subject to certain limitations. The plan includes an employer matching contribution equal to 50% of the first 6% an employee contributes each pay period. Ciena may also make discretionary annual profit contributions up to the IRS regulated limit. Ciena has made no profit sharing contributions to date. During fiscal 2019, 2018 and 2017, Ciena made matching contributions of approximately $5.9 million, $5.8 million and $5.7 million, respectively.