Inventories (Tables)

12 Months Ended

Oct. 31, 2019

Inventory Disclosure [Abstract]

Inventories

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

	October 31,
	2019			2018
Raw materials	$	99,041		$	67,468
Work-in-process	13,657			9,589
Finished goods	226,622			188,575
Deferred cost of goods sold	53,051			48,057
	392,371			313,689
Reserve for excess and obsolescence	(47,322		)	(50,938		)
	$	345,049		$	262,751

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
2017	$	62,503	$	35,459	$	46,756	$	51,206
2018	$	51,206	$	30,615	$	30,883	$	50,938
2019	$	50,938	$	28,085	$	31,701	$	47,322