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Subsequent Events	3 Months Ended
	Jan. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the first quarter of fiscal 2020 through March 6, 2020, Ciena repurchased an additional 443,958 shares of its common stock, for an aggregate purchase price of $18.6 million at an average price of $41.90 per share, inclusive of repurchases pending settlement. As of March 6, 2020, Ciena has repurchased an aggregate of 5,570,535 shares and has an aggregate of $280.6 million of authorized funds remaining under its stock repurchase program.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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