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ABL Credit Facility	12 Months Ended
ABL Credit Facility	Oct. 31, 2017
Line of Credit Facility [Abstract]
ABL Credit Facility	ABL CREDIT FACILITY Ciena Corporation and certain of its subsidiaries are parties to a senior secured asset-based revolving credit facility (the “ABL Credit Facility”) providing for a total commitment of $250 million with a maturity date of December 31, 2020. Ciena principally uses the ABL Credit Facility to support the issuance of letters of credit that arise in the ordinary course of its business and thereby to reduce its use of cash required to collateralize these instruments. As of October 31, 2017, letters of credit totaling $69.6 million were collateralized by the ABL Credit Facility. There were no borrowings outstanding under the ABL Credit Facility as of October 31, 2017.