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Accounts Receivable (Tables) | 12 Months Ended
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Oct. 31, 2020
Receivables [Abstract] |
Activity in allowance for doubtful accounts | The following table summarizes the activity in Ciena’s allowance for doubtful accounts for the fiscal years indicated (in thousands):
Year Ended |  | Beginning Balance |  | Provisions |  | Net Deductions |  | Ending Balance
November 3, 2018 |  | $ | 17,580 |  |  | $ | 2,700 |  |  | $ | 2,902 |  |  | $ | 17,378 |
November 2, 2019 |  | $ | 17,378 |  |  | $ | 6,740 |  |  | $ | 4,017 |  |  | $ | 20,101 |
October 31, 2020 |  | $ | 20,101 |  |  | $ | 8,855 |  |  | $ | 18,358 |  |  | $ | 10,598 |

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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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