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INVENTORIES (Tables)

12 Months Ended

Oct. 30, 2021

Inventory Disclosure [Abstract]

Inventories

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

			October 30, 2021						October 31, 2020
Raw materials			$	175,399					$	119,481
Work-in-process			10,260						13,738
Finished goods			180,800						210,050
Deferred cost of goods sold			44,765						40,747
			411,224						384,016
Reserve for excess and obsolescence			(36,959)						(39,637)
			$	374,265					$	344,379

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
November 2, 2019						$	50,938					$	28,085					$	31,701					$	47,322
October 31, 2020						$	47,322					$	24,701					$	32,386					$	39,637
October 30, 2021						$	39,637					$	17,850					$	20,528					$	36,959

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Schedule of Inventory Valuation Reserves [Table Text Block]

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Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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