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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Oct. 29, 2022
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 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 
Corporate debt securities— 54,495 — 54,495 
Foreign currency forward contracts— 251 — 251 
Forward starting 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 
 October 30, 2021
 Level 1Level 2Level 3Total
Assets:    
Money market funds$1,120,851 $— $— $1,120,851 
Bond mutual fund75,425 — — 75,425 
Time deposits71,226 — — 71,226 
Deferred compensation plan assets12,968 — — 12,968 
U.S. government obligations— 251,521 — 251,521 
Foreign currency forward contracts— 14,935 — 14,935 
Total assets measured at fair value$1,280,470 $266,456 $— $1,546,926 
Liabilities:
Foreign currency forward contracts$— $716 $— $716 
Forward starting interest rate swaps— 15,928 — 15,928 
Total liabilities measured at fair value$— $16,644 $— $16,644 
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 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 

 October 30, 2021
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$1,267,502 $— $— $1,267,502 
Short-term investments— 181,483 — 181,483 
Prepaid expenses and other— 14,935 — 14,935 
Long-term investments— 70,038 — 70,038 
Other long-term assets12,968 — — 12,968 
Total assets measured at fair value$1,280,470 $266,456 $— $1,546,926 
Liabilities:
Accrued liabilities and other short-term obligations$— $716 $— $716 
Other long-term obligations— 15,928 — 15,928 
Total liabilities measured at fair value$— $16,644 $— $16,644