Inventories (Tables)

12 Months Ended

Oct. 31, 2012

Inventory Disclosure [Abstract]

Inventories

As of the dates indicated, inventories are comprised of the following (in thousands):

	October 31,
	2011			2012
Raw materials	$	45,333		$	39,678
Work-in-process	13,851			10,736
Finished goods	134,998			178,210
Deferred cost of goods sold	67,665			71,484
	261,847			300,108
Provision for excess and obsolescence	(31,771		)	(40,010		)
	$	230,076		$	260,098

Activity in reserve for excess and obsolete inventory

The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands):

	Balance at
Year ended	beginning of						Balance at
October 31,	period		Provisions		Disposals		end of period
2010	$	24,002	$	13,696	$	6,931	$	30,767
2011	$	30,767	$	17,334	$	16,330	$	31,771
2012	$	31,771	$	23,438	$	15,199	$	40,010