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ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Oct. 30, 2021
Receivables [Abstract] |
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
November 2, 2019 |  | $ | 17,378 |  |  | $ | — |  |  | $ | 6,740 |  |  | $ | 4,017 |  |  | $ | 20,101 |
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 |
(1)The reduction in Ciena’s allowance for credit losses as of October 31, 2020 compared to November 2, 2019 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.

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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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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