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SUBSEQUENT EVENTS	9 Months Ended
	Jul. 31, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the third quarter of fiscal 2021 through September 3, 2021, Ciena repurchased an additional 176,815 shares of its common stock, for an aggregate purchase price of $10.0 million at an average price of $56.57 per share, inclusive of repurchases pending settlement. As of September 3, 2021, Ciena has repurchased an aggregate of 7,091,166 shares and has an aggregate of $200.0 million of authorized funds remaining under its stock repurchase program. Vyatta Routing and Switching Technology Acquisition On August 31, 2021, Ciena entered into a definitive agreement with AT&T to acquire its Vyatta virtual routing and switching technology. The acquisition reflects Ciena’s continued investment in its Routing and Switching solutions roadmap and resources. Ciena plans to integrate the engineering personnel to be hired through this transaction into its Routing and Switching research and development (R&D) organization.

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- Definition

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.

+ References

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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