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Subsequent Events	6 Months Ended
Subsequent Events	May 01, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the second quarter of fiscal 2021 through June 4, 2021, Ciena repurchased an additional 195,920 shares of its common stock, for an aggregate purchase price of $10.4 million at an average price of $52.84 per share, inclusive of repurchases pending settlement. As of June 4, 2021, Ciena has repurchased an aggregate of 6,641,907 shares and has an aggregate of $225.6 million of authorized funds remaining under its stock repurchase program.