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GOODWILL (Details)
$ in Thousands
6 Months Ended
Apr. 30, 2016
USD ($)
Goodwill [Roll Forward]  
Goodwill $ 256,434
Acquisitions 10,083
Impairments 0
Translation 1,164 [1]
Goodwill 267,681
Software and Software-Related Services  
Goodwill [Roll Forward]  
Goodwill 201,428
Acquisitions 0
Impairments 0
Translation 0 [1]
Goodwill 201,428
Networking Platforms  
Goodwill [Roll Forward]  
Goodwill 55,006
Acquisitions 10,083
Impairments 0
Translation 1,164 [1]
Goodwill $ 66,253
[1] Represents translation on goodwill related to the acquisition of the HSPC assets by Ciena's Canadian subsidiary.