Accounts Receivable	3 Months Ended
Accounts Receivable	Jan. 31, 2015
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE As of October 31, 2014, there were no individual customers that accounted for greater than 10% of net accounts receivable. As of January 31, 2015, one customer accounted for 17.1% of net accounts receivable. Ciena has not historically experienced a significant amount of bad debt expense. Allowance for doubtful accounts was $2.1 million and $2.0 million as of October 31, 2014 and January 31, 2015, respectively.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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