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ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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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 Ended |  | Beginning Balance |  | Effect of adoption of new accounting standard (Note 1) |  | Provisions |  | Net Deductions |  | Ending 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.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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