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Long-Lived Asset Impairments	12 Months Ended
Long-Lived Asset Impairments	Oct. 31, 2012
Tangible Asset Impairment Charges [Abstract]
LONG-LIVED ASSET IMPAIRMENTS	LONG-LIVED ASSET IMPAIRMENTS Due to the reorganization as a result of the MEN Acquisition, Ciena performed an impairment analysis of its long-lived assets during the second quarter of fiscal 2010. Based on Ciena’s estimate of future undiscounted cash flows by asset group, no impairment was required. Due to the lack of a triggering event, no impairment analysis was performed in fiscal 2011 or 2012.