Accounts Receivable	9 Months Ended
Accounts Receivable	Jul. 31, 2014
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE As of October 31, 2013, two customers each accounted for greater than 10% of net accounts receivable, and in the aggregate accounted for 22.5% of net accounts receivable. As of July 31, 2014, two customers each accounted for greater than 10% of net accounts receivable, and in the aggregate accounted for 24.3% of net accounts receivable. Allowance for doubtful accounts was $2.0 million and $2.7 million as of October 31, 2013 and July 31, 2014, respectively. Ciena has not historically experienced a significant amount of bad debt expense.

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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