Inventories (Tables)

12 Months Ended

Oct. 31, 2014

Inventory Disclosure [Abstract]

Inventories

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

	October 31,
	2013			2014
Raw materials	$	53,274		$	64,853
Work-in-process	7,773			8,371
Finished goods	153,855			165,799
Deferred cost of goods sold	75,764			75,763
	290,666			314,786
Provision for excess and obsolescence	(41,563		)	(60,126		)
	$	249,103		$	254,660

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,	fiscal year		Provisions		Disposals		end of fiscal year
2012	$	31,771	$	23,438	$	15,199	$	40,010
2013	$	40,010	$	19,938	$	18,385	$	41,563
2014	$	41,563	$	32,332	$	13,769	$	60,126