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Accounts Receivable | 12 Months Ended
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Oct. 31, 2020
Receivables [Abstract] |
ACCOUNTS RECEIVABLE | ACCOUNTS RECEIVABLE As of October 31, 2020, no customer accounted for 10.0% of net accounts receivable. As of November 2, 2019, one customer accounted for 12.0% of net accounts receivable. Ciena has not historically experienced a significant amount of bad debt expense. The reduction in Ciena’s allowance for doubtful accounts 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. 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 The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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