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ABL CREDIT FACILITY	6 Months Ended
ABL CREDIT FACILITY	Apr. 30, 2017
Debt Disclosure [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”). 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 April 30, 2017, letters of credit totaling $72.4 million were collateralized by the ABL Credit Facility. There were no borrowings outstanding under the ABL Credit Facility as of April 30, 2017.