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ACCOUNTS RECEIVABLE | 12 Months Ended
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Oct. 28, 2023
Receivables [Abstract] |
ACCOUNTS RECEIVABLE | ACCOUNTS RECEIVABLE As of October 28, 2023, two customers accounted for 11.0% and 10.0% of net accounts receivable, respectively. As of October 29, 2022, two customers accounted for 13.0% and 11.0% of net accounts receivable, respectively. Ciena has not historically experienced a significant amount of bad debt expense. 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 |  | Provisions |  | Net Deductions |  | Ending Balance
October 30, 2021 |  | $ | 10,598 |  |  | $ | 2,206 |  |  | $ | 2,346 |  |  | $ | 4,238 |  |  | $ | 10,912 |
October 29, 2022(1) |  | $ | 10,912 |  |  | $ | — |  |  | $ | 4,199 |  |  | $ | 4,153 |  |  | $ | 10,958 |
October 28, 2023 |  | $ | 10,958 |  |  | $ | — |  |  | $ | 5,718 |  |  | $ | 5,022 |  |  | $ | 11,654 |
(1) 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. Accounts Receivable Factoring During fiscal 2023 and 2022, the gross amount of trade accounts receivables sold totaled approximately $60.3 million and $11.8 million, respectively. Prior to the start of fiscal 2022, Ciena had not entered into any factoring arrangements. Factoring related expense recorded to interest and other income (loss), net was $3.1 million and $0.6 million for fiscal 2023 and fiscal 2022, respectively.

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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 -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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