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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Apr. 27, 2024
Fair Value Disclosures [Abstract]  
Schedule of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis As of the dates indicated, the following tables summarize the assets and liabilities that are recorded at fair value on a recurring basis (in thousands):
 April 27, 2024
 Level 1Level 2Level 3Total
Assets:    
Money market funds$700,930 $— $— $700,930 
Bond mutual fund158,297 — — 158,297 
Time deposits164,208 — — 164,208 
Deferred compensation plan assets14,479 — — 14,479 
U.S. government obligations— 260,374 — 260,374 
Corporate debt securities— 59,620 — 59,620 
Foreign currency forward contracts— 1,341 — 1,341 
Interest rate swaps— 30,296 — 30,296 
Total assets measured at fair value$1,037,914 $351,631 $— $1,389,545 
Liabilities:
Foreign currency forward contracts$— $6,173 $— $6,173 
Total liabilities measured at fair value$— $6,173 $— $6,173 

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 
Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets
As of the dates indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands):
 April 27, 2024
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$1,007,962 $3,887 $— $1,011,849 
Short-term investments15,473 150,147 — 165,620 
Prepaid expenses and other— 1,341 — 1,341 
Long-term investments— 165,960 — 165,960 
Other long-term assets14,479 30,296 — 44,775 
Total assets measured at fair value$1,037,914 $351,631 $— $1,389,545 
Liabilities:
Accrued liabilities and other short-term obligations$— $6,173 $— $6,173 
Total liabilities measured at fair value$— $6,173 $— $6,173 
 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