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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities as Presented on Ciena's Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Nov. 01, 2025
Nov. 02, 2024
Assets:    
Total assets measured at fair value $ 1,198,881 $ 1,269,373
Liabilities:    
Total liabilities measured at fair value 7,659 9,155
Level 1    
Assets:    
Total assets measured at fair value 927,807 858,123
Liabilities:    
Total liabilities measured at fair value 0 0
Level 2    
Assets:    
Total assets measured at fair value 271,074 411,250
Liabilities:    
Total liabilities measured at fair value 7,659 9,155
Level 3    
Assets:    
Total assets measured at fair value 0 0
Liabilities:    
Total liabilities measured at fair value 0 0
Cash equivalents    
Assets:    
Cash equivalents 901,176 841,665
Cash equivalents | Level 1    
Assets:    
Cash equivalents 901,077 832,239
Cash equivalents | Level 2    
Assets:    
Cash equivalents 99 9,426
Cash equivalents | Level 3    
Assets:    
Cash equivalents 0 0
Short-term investments    
Assets:    
Short-term investments 216,148 316,343
Short-term investments | Level 1    
Assets:    
Short-term investments 5,551 9,365
Short-term investments | Level 2    
Assets:    
Short-term investments 210,597 306,978
Short-term investments | Level 3    
Assets:    
Short-term investments 0 0
Prepaid expenses and other    
Assets:    
Other assets 3,236 2,149
Prepaid expenses and other | Level 1    
Assets:    
Other assets 0 0
Prepaid expenses and other | Level 2    
Assets:    
Other assets 3,236 2,149
Prepaid expenses and other | Level 3    
Assets:    
Other assets 0 0
Long-term investments    
Assets:    
Long-term investments 57,142 80,920
Long-term investments | Level 1    
Assets:    
Long-term investments 0 0
Long-term investments | Level 2    
Assets:    
Long-term investments 57,142 80,920
Long-term investments | Level 3    
Assets:    
Long-term investments 0 0
Other long-term assets    
Assets:    
Other assets 21,179 28,296
Other long-term assets | Level 1    
Assets:    
Other assets 21,179 16,519
Other long-term assets | Level 2    
Assets:    
Other assets 0 11,777
Other long-term assets | Level 3    
Assets:    
Other assets 0 0
Accrued liabilities and other short-term obligations    
Liabilities:    
Accrued liabilities and other short-term obligations 6,314 9,155
Accrued liabilities and other short-term obligations | Level 1    
Liabilities:    
Accrued liabilities and other short-term obligations 0 0
Accrued liabilities and other short-term obligations | Level 2    
Liabilities:    
Accrued liabilities and other short-term obligations 6,314 9,155
Accrued liabilities and other short-term obligations | Level 3    
Liabilities:    
Accrued liabilities and other short-term obligations 0 $ 0
Other long-term obligations    
Liabilities:    
Other long-term obligations 1,345  
Other long-term obligations | Level 1    
Liabilities:    
Other long-term obligations 0  
Other long-term obligations | Level 2    
Liabilities:    
Other long-term obligations 1,345  
Other long-term obligations | Level 3    
Liabilities:    
Other long-term obligations $ 0