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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Jan. 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):
 January 27, 2024
 Level 1Level 2Level 3Total
Assets:    
Money market funds$895,909 $— $— $895,909 
Bond mutual fund156,300 — — 156,300 
Time deposits144,126 — — 144,126 
Deferred compensation plan assets14,614 — — 14,614 
U.S. government obligations— 142,624 — 142,624 
Corporate debt securities— 57,619 — 57,619 
Foreign currency forward contracts— 3,020 — 3,020 
Interest rate swaps— 12,501 — 12,501 
Total assets measured at fair value$1,210,949 $215,764 $— $1,426,713 
Liabilities:
Foreign currency forward contracts$— $6,184 $— $6,184 
Total liabilities measured at fair value$— $6,184 $— $6,184 

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):
 January 27, 2024
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$1,183,109 $2,929 $— $1,186,038 
Short-term investments13,226 93,452 — 106,678 
Prepaid expenses and other— 3,020 — 3,020 
Long-term investments— 103,862 — 103,862 
Other long-term assets14,614 12,501 — 27,115 
Total assets measured at fair value$1,210,949 $215,764 $— $1,426,713 
Liabilities:
Accrued liabilities and other short-term obligations$— $6,184 $— $6,184 
Total liabilities measured at fair value$— $6,184 $— $6,184 
 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