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SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Apr. 30, 2022
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the second quarter of fiscal 2022 through June 3, 2022, Ciena repurchased an additional 1,161,320 shares of its common stock, for an aggregate purchase price of $60.0 million at an average price of $51.67 per share, inclusive of repurchases pending settlement. As of June 3, 2022, Ciena has repurchased an aggregate of 6,246,078 shares and has $603.0 million of authorized funds remaining under its stock repurchase program.