INVENTORIES (Tables)

12 Months Ended

Oct. 28, 2023

Inventory Disclosure [Abstract]

Schedule of Inventories

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

	October 28, 2023		October 29, 2022
Raw materials	$	664,797	$	664,916
Work-in-process	55,242		18,232
Finished goods	314,168		258,584
Deferred cost of goods sold	66,634		41,084
Gross inventories	1,100,841		982,816
Reserve for excess and obsolescence	(50,003)		(36,086)
Inventories, net	$	1,050,838	$	946,730

Schedule of 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 Balance		Provisions		Disposals		Ending Balance
October 30, 2021	$	39,637	$	17,850	$	20,528	$	36,959
October 29, 2022	$	36,959	$	16,184	$	17,057	$	36,086
October 28, 2023	$	36,086	$	29,464	$	15,547	$	50,003