v3.26.1
FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Aug. 01, 2026
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 were recorded at fair value on a recurring basis (in thousands):
August 1, 2026
Level 1Level 2Level 3Total
Assets:
Money market funds$1,877,098 $— $— $1,877,098 
Bond mutual fund121,272 — — 121,272 
Time deposits93,087 — — 93,087 
Deferred compensation plan assets27,357 — — 27,357 
U.S. government obligations— 183,834 — 183,834 
Corporate debt securities— 222,417 — 222,417 
Foreign currency forward contracts— 4,322 — 4,322 
Total assets measured at fair value$2,118,814 $410,573 $— $2,529,387 
Liabilities:
Foreign currency forward contracts$— $11,003 $— $11,003 
Total liabilities measured at fair value$— $11,003 $— $11,003 
November 1, 2025
Level 1Level 2Level 3Total
Assets:
Money market funds$713,707 $— $— $713,707 
Bond mutual fund117,931 — — 117,931 
Time deposits74,990 — — 74,990 
Deferred compensation plan assets21,179 — — 21,179 
U.S. government obligations— 147,770 — 147,770 
Corporate debt securities— 120,068 — 120,068 
Foreign currency forward contracts— 3,236 — 3,236 
Total assets measured at fair value$927,807 $271,074 $— $1,198,881 
Liabilities:
Foreign currency forward contracts$— $6,314 $— $6,314 
Forward starting interest rate swaps— 1,345 — 1,345 
Total liabilities measured at fair value$— $7,659 $— $7,659 
Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets
As of the dates indicated, the assets and liabilities above were presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands):
August 1, 2026
Level 1Level 2Level 3Total
Assets:
Cash equivalents$2,087,490 $12,372 $— $2,099,862 
Short-term investments3,967 180,326 — 184,293 
Prepaid expenses and other— 4,322 — 4,322 
Long-term investments— 213,553 — 213,553 
Other long-term assets27,357 — — 27,357 
Total assets measured at fair value$2,118,814 $410,573 $— $2,529,387 
Liabilities:
Accrued liabilities and other short-term obligations$— $11,003 $— $11,003 
Total liabilities measured at fair value$— $11,003 $— $11,003 

November 1, 2025
Level 1Level 2Level 3Total
Assets:
Cash equivalents$901,077 $99 $— $901,176 
Short-term investments5,551 210,597 — 216,148 
Prepaid expenses and other— 3,236 — 3,236 
Long-term investments— 57,142 — 57,142 
Other long-term assets21,179 — — 21,179 
Total assets measured at fair value$927,807 $271,074 $— $1,198,881 
Liabilities:
Accrued liabilities and other short-term obligations$— $6,314 $— $6,314 
Other long-term obligations— 1,345 — 1,345 
Total liabilities measured at fair value$— $7,659 $— $7,659