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Subsequent Events	6 Months Ended
Subsequent Events	Apr. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the second quarter of fiscal 2019 through June 7, 2019, Ciena repurchased an additional 485,235 shares of its common stock, for an aggregate purchase price of $17.3 million at an average price of $35.63 per share, inclusive of repurchases pending settlement. As of June 7, 2019, Ciena has repurchased an aggregate of 2,237,760 shares and has an aggregate of $416.2 million of authorized funds remaining under its Stock Repurchase Program.