SUBSEQUENT EVENTS	3 Months Ended
Jan. 29, 2022
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSStock Repurchase Program and Accelerated Share Repurchase AgreementOn February 15, 2022, Ciena received delivery of the remaining 884,531 shares of common stock repurchased under the ASR Agreement, for a total delivery of approximately 3.6 million shares, calculated based on the average of the daily volume-weighted average prices of Ciena’s common stock of $69.78 for the period December 14, 2021 to February 11, 2022, less a discount, which completed the repurchases contemplated by the ASR Agreement.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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