Stockholders' Equity (Details) - USD ($)	6 Months Ended
Apr. 30, 2019	Dec. 13, 2018
Equity [Abstract]
Stock repurchase program authorized amount		$ 500,000,000
Shares repurchased for tax withholdings on vesting of restricted stock units	$ 15,865,000

Stock Repurchased During Period, Shares Purchased for Tax Withholdings for Share-based Compensation, Value

No definition available.

Name:	cien_StockRepurchasedDuringPeriodSharesPurchasedforTaxWithholdingsforSharebasedCompensationValue
Namespace Prefix:	cien_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration