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FAIR VALUE MEASUREMENTS
 9 Months Ended
Jul. 31, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS    As of the date indicated, the following table summarizes the assets and liabilities that are recorded at fair value on a recurring basis (in thousands):
 July 31, 2021
 Level 1Level 2Level 3Total
Assets:    
Money market funds$909,976 $— $— $909,976 
Bond mutual fund75,398 — — 75,398 
Time deposits30,029 — — 30,029 
Deferred compensation plan assets12,380 — — 12,380 
U.S. government obligations— 242,898 — 242,898 
Foreign currency forward contracts— 8,598 — 8,598 
Total assets measured at fair value$1,027,783 $251,496 $— $1,279,279 
Liabilities:
Foreign currency forward contracts$— $3,709 $— $3,709 
Forward starting interest rate swaps— 20,682 — 20,682 
Total liabilities measured at fair value$— $24,391 $— $24,391 
October 31, 2020
Level 1Level 2Level 3Total
Assets:
Money market funds$889,293 $— $— $889,293 
Bond mutual fund50,361 — — 50,361 
Deferred compensation plan assets8,213 — — 8,213 
U.S. government obligations— 232,893 — 232,893 
Foreign currency forward contracts— 82 — 82 
Total assets measured at fair value$947,867 $232,975 $— $1,180,842 
Liabilities:
Foreign currency forward contracts$— $681 $— $681 
Forward starting interest rate swaps— 28,513 — 28,513 
Total liabilities measured at fair value$— $29,194 $— $29,194 

As of the date indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands):
 July 31, 2021
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$1,015,403 $— $— $1,015,403 
Short-term investments— 182,010 — 182,010 
Prepaid expenses and other— 8,598 — 8,598 
Long-term investments— 60,888 — 60,888 
Other long-term assets12,380 — — 12,380 
Total assets measured at fair value$1,027,783 $251,496 $— $1,279,279 
Liabilities:
Accrued liabilities and other short-term obligations$— $3,709 $— $3,709 
Other long-term obligations— 20,682 — 20,682 
Total liabilities measured at fair value$— $24,391 $— $24,391 
 October 31, 2020
 Level 1Level 2Level 3Total
Assets:    
Cash equivalents$939,654 $— $— $939,654 
Short-term investments— 150,667 — 150,667 
Prepaid expenses and other— 82 — 82 
Other long-term assets8,213 82,226 — 90,439 
Total assets measured at fair value$947,867 $232,975 $— $1,180,842 
Liabilities:
Accrued liabilities and other short-term obligations$— $681 $— $681 
Other long-term obligations— 28,513 — 28,513 
Total liabilities measured at fair value$— $29,194 $— $29,194 

Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented.