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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Oct. 28, 2023
Fair Value Disclosures [Abstract]  
Schedule of Summary of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis
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):
 October 28, 2023
 Level 1Level 2Level 3Total
Assets:    
Money market funds$661,101 $— $— $661,101 
Bond mutual fund104,171 — — 104,171 
Time deposits138,829 — — 138,829 
Deferred compensation plan assets11,456 — — 11,456 
U.S. government obligations— 169,909 — 169,909 
Corporate debt securities— 59,569 — 59,569 
Foreign currency forward contracts— 1,119 — 1,119 
Interest rate swaps— 24,953 — 24,953 
Total assets measured at fair value$915,557 $255,550 $— $1,171,107 
Liabilities:
Foreign currency forward contracts$— $14,509 $— $14,509 
Total liabilities measured at fair value$— $14,509 $— $14,509 
 October 29, 2022
 Level 1Level 2Level 3Total
Assets:    
Money market funds$639,024 $— $— $639,024 
Bond mutual fund71,145 — — 71,145 
Time deposits55,825 — — 55,825 
Deferred compensation plan assets12,751 — — 12,751 
U.S. government obligations— 134,584 — 134,584 
Commercial paper— 54,495 — 54,495 
Foreign currency forward contracts— 251 — 251 
Interest rate swaps— 12,306 — 12,306 
Total assets measured at fair value$778,745 $201,636 $— $980,381 
Liabilities:
Foreign currency forward contracts$— $15,605 $— $15,605 
Total liabilities measured at fair value$— $15,605 $— $15,605 
Schedule of Assets and Liabilities are Presented on Ciena's Condensed Consolidated Balance Sheet
As of the dates indicated, the assets and liabilities above were presented on Ciena’s Consolidated Balance Sheets as follows (in thousands):
 October 28, 2023
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$891,788 $2,760 $— $894,548 
Short-term investments12,313 92,440 — 104,753 
Prepaid expenses and other— 1,119 — 1,119 
Long-term investments— 134,278 — 134,278 
Other long-term assets11,456 24,953 — 36,409 
Total assets measured at fair value$915,557 $255,550 $— $1,171,107 
Liabilities:
Accrued liabilities and other short-term obligations$— $14,509 $— $14,509 
Total liabilities measured at fair value$— $14,509 $— $14,509 

 October 29, 2022
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$757,725 $7,974 $— $765,699 
Short-term investments8,269 145,720 — 153,989 
Prepaid expenses and other— 251 — 251 
Long-term investments— 35,385 — 35,385 
Other long-term assets12,751 12,306 — 25,057 
Total assets measured at fair value$778,745 $201,636 $— $980,381 
Liabilities:
Accrued liabilities and other short-term obligations$— $15,605 $— $15,605 
Total liabilities measured at fair value$— $15,605 $— $15,605