Inventories (Tables)

12 Months Ended

Oct. 31, 2015

Inventory Disclosure [Abstract]

Inventories

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

	October 31,
	2014			2015
Raw materials	$	64,853		$	53,082
Work-in-process	8,371			9,120
Finished goods	165,799			125,966
Deferred cost of goods sold	75,763			55,995
	314,786			244,163
Provision for excess and obsolescence	(60,126		)	(53,001		)
	$	254,660		$	191,162

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):

Year ended	Beginning						Ending
October 31,	Balance		Provisions		Disposals		Balance
2013	$	40,010	$	19,938	$	18,385	$	41,563
2014	$	41,563	$	32,332	$	13,769	$	60,126
2015	$	60,126	$	26,846	$	33,971	$	53,001