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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Oct. 29, 2022
Receivables [Abstract]  
Schedule Of activity in allowance for doubtful accounts The following table summarizes the activity in Ciena’s allowance for credit losses for the fiscal years indicated (in thousands):
Year EndedBeginning BalanceEffect of adoption of new accounting standard (Note 1)ProvisionsNet DeductionsEnding Balance
October 31, 2020(1)
$20,101 $— $8,855 $18,358 $10,598 
October 30, 2021$10,598 $2,206 $2,346 $4,238 $10,912 
October 29, 2022(2)
$10,912 $— $4,199 $4,153 $10,958 
(1)The net deduction in Ciena’s allowance for credit losses as of October 31, 2020 is primarily due to the final settlement from a significant asset impairment of $12.2 million for a trade receivable related to a single customer in the APAC region recorded in fiscal 2017.
(2)On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena’s allowance for doubtful accounts includes a provision for a significant asset impairment of $1.8 million for a trade receivable related to this decision.