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Subsequent Event	3 Months Ended
Subsequent Event	Jan. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENT Stock Repurchase Program From the end of the first quarter of fiscal 2018 through March 5, 2018, Ciena repurchased an additional 611,514 shares of its common stock, for an aggregate purchase price of $13.8 million at an average price of $22.52 per share, including of repurchases pending settlement. As of March 5, 2018, Ciena has an aggregate of $280.5 million of authorized funds remaining under its Stock Repurchase Program.