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ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Nov. 01, 2025
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 EndedBeginning BalanceProvisionsNet DeductionsEnding Balance
October 28, 2023
$10,958 $5,718 $5,022 $11,654 
November 2, 2024
$11,654 $7,996 $9,770 $9,880 
November 1, 2025
$9,880 $4,226 $2,894 $11,212