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FAIR VALUE MEASUREMENTS
 12 Months Ended
Nov. 01, 2025
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
As of the dates indicated, the following tables summarize the fair value of assets and liabilities that were recorded at fair value on a recurring basis (in thousands):
 November 1, 2025
 Level 1Level 2Level 3Total
Assets:    
Money market funds$713,707 $— $— $713,707 
Bond mutual fund117,931 — — 117,931 
Time deposits74,990 — — 74,990 
Deferred compensation plan assets21,179 — — 21,179 
U.S. government obligations— 147,770 — 147,770 
Corporate debt securities— 120,068 — 120,068 
Foreign currency forward contracts— 3,236 — 3,236 
Total assets measured at fair value$927,807 $271,074 $— $1,198,881 
Liabilities:
Foreign currency forward contracts$— $6,314 $— $6,314 
Forward starting interest rate swaps— 1,345 — 1,345 
Total liabilities measured at fair value$— $7,659 $— $7,659 
 November 2, 2024
 Level 1Level 2Level 3Total
Assets:    
Money market funds$636,097 $— $— $636,097 
Bond mutual fund112,703 — — 112,703 
Time deposits92,804 — — 92,804 
Deferred compensation plan assets16,519 — — 16,519 
U.S. government obligations— 286,181 — 286,181 
Commercial paper— 111,143 — 111,143 
Foreign currency forward contracts— 2,149 — 2,149 
Interest rate swaps— 11,777 — 11,777 
Total assets measured at fair value$858,123 $411,250 $— $1,269,373 
Liabilities:
Foreign currency forward contracts$— $9,155 $— $9,155 
Total liabilities measured at fair value$— $9,155 $— $9,155 
As of the dates indicated, the assets and liabilities above were presented on Ciena’s Consolidated Balance Sheets as follows (in thousands):
 November 1, 2025
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$901,077 $99 $— $901,176 
Short-term investments5,551 210,597 — 216,148 
Prepaid expenses and other— 3,236 — 3,236 
Long-term investments— 57,142 — 57,142 
Other long-term assets21,179 — — 21,179 
Total assets measured at fair value$927,807 $271,074 $— $1,198,881 
Liabilities:
Accrued liabilities and other short-term obligations$— $6,314 $— $6,314 
Other long-term obligations— 1,345 — 1,345 
Total liabilities measured at fair value$— $7,659 $— $7,659 

 November 2, 2024
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$832,239 $9,426 $— $841,665 
Short-term investments9,365 306,978 — 316,343 
Prepaid expenses and other— 2,149 — 2,149 
Long-term investments— 80,920 — 80,920 
Other long-term assets16,519 11,777 — 28,296 
Total assets measured at fair value$858,123 $411,250 $— $1,269,373 
Liabilities:
Accrued liabilities and other short-term obligations$— $9,155 $— $9,155 
Total liabilities measured at fair value$— $9,155 $— $9,155 

There were no transfers between Level 1 and Level 2 fair value measurements during the periods presented.