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Investments and Fair Value Measurements (Tables)
 12 Months Ended
Sep. 24, 2021
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured on Recurring Basis Our cash and investment portfolio consisted of the following (in thousands):
September 24, 2021
CostUnrealizedEstimated Fair Value
GainsLossesTotalLevel 1Level 2Level 3
Cash and cash equivalents:
Cash$990,182 $— $— $990,182 $990,182 $— $— 
Cash equivalents:
Money market funds235,198 — — 235,198 235,198 — — 
Cash and cash equivalents1,225,380 — — 1,225,380 1,225,380 — — 
Short-term investments:
Certificate of deposit1,795 — — 1,795 — 1,795 — 
U.S. agency securities1,096 6 — 1,102 — 1,102 — 
Government bonds100 2 — 102 102 — — 
Commercial paper5,184 2 — 5,186 — 5,186 — 
Corporate bonds18,850 116 — 18,966 — 18,966 — 
Municipal debt securities11,660 29 (1)11,688 — 11,688 — 
Short-term investments38,685 155 (1)38,839 102 38,737 — 
Long-term investments:
U.S. agency securities2,264 13 (2)2,275 — 2,275 — 
Government bonds11,784 38 (16)11,806 4,966 6,840 — 
Corporate bonds32,116 61 (25)32,152 — 32,152 — 
Municipal debt securities10,080 58 (8)10,130 — 10,130 — 
Other long-term investments (1)6,456 — — 6,456 — — — 
Long-term investments62,700 170 (51)62,819 4,966 51,397 — 
Total cash, cash equivalents, and investments$1,326,765 $325 $(52)$1,327,038 $1,230,448 $90,134 $— 
Investments held in supplemental retirement plan:
Assets$4,975 $— $— $4,975 $4,975 $— $— 
Included in prepaid expenses and other current assets and other non-current assets
Liabilities$4,975 $— $— $4,975 $4,975 $— $— 
Included in accrued liabilities and other non-current liabilities
Currency derivatives as hedge instruments:
Assets: Included in other current assets$— $689 $— $689 $— $689 $— 
Liabilities: Included in other accrued liabilities— — (197)(197)— (197)— 
(1)Other long-term investments as of September 24, 2021 is comprised of one equity method investment which is not carried at fair value of $6.5 million.
September 25, 2020
CostUnrealizedEstimated Fair Value
GainsLossesTotalLevel 1Level 2Level 3
Cash and cash equivalents:
Cash$856,740 $— $— $856,740 $856,740 $— $— 
Cash equivalents:
Commercial paper900 — — 900 — 900 — 
Money market funds214,111 — — 214,111 214,111 — — 
Government bonds125 — — 125 125 — — 
Cash and cash equivalents1,071,876 — — 1,071,876 1,070,976 900 — 
Short-term investments:
Certificate of deposit2,277 1 — 2,278 — 2,278 — 
U.S. agency securities999 12 — 1,011 — 1,011 — 
Government bonds5,118 47 — 5,165 1,370 3,795 — 
Commercial paper4,727 4 — 4,731 — 4,731 — 
Corporate bonds18,754 87 (3)18,838 — 18,838 — 
Municipal debt securities14,828 97 — 14,925 — 14,925 — 
Short-term investments46,703 248 (3)46,948 1,370 45,578 — 
Long-term investments:
U.S. agency securities2,214 56 — 2,270 — 2,270 — 
Government bonds5,137 80 — 5,217 1,633 3,584 — 
Corporate bonds24,657 419 (7)25,069 — 25,069 — 
Municipal debt securities15,220 203 (6)15,417 — 15,417 — 
Other long-term investments (1)4,176 — — 4,176 — — — 
Long-term investments51,404 758 (13)52,149 1,633 46,340 — 
Total cash, cash equivalents, and investments$1,169,983 $1,006 $(16)$1,170,973 $1,073,979 $92,818 $— 
Investments held in supplemental retirement plan:
Assets$4,279 $— $— $4,279 $4,279 $— $— 
Included in prepaid expenses and other current assets and other non-current assets
Liabilities$4,279 $— $— $4,279 $4,279 $— $— 
Included in accrued liabilities and other non-current liabilities
Currency derivatives as hedge instruments:
Assets: Included in other current assets$— $4,267 $— $4,267 $— $4,267 $— 
Assets: included in other non-current assets— 369 — 369 — 369 — 
Liabilities: Included in other accrued liabilities— — (79)(79)— (79)— 
(1)Other long-term investments as of September 25, 2020 is comprised of one equity method investment which is not carried at fair value of $4.7 million.
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value The following table presents the gross unrealized losses and fair value for those AFS securities that were in an unrealized loss position for less than twelve months as of September 24, 2021 and September 25, 2020 (in thousands):
September 24, 2021September 25, 2020
Less Than 12 MonthsLess Than 12 Months
Investment TypeFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Certificate of deposit$600 $— $— $— 
U.S. agency securities1,449 (2)— — 
Government bonds8,940 (16)— — 
Corporate bonds22,964 (25)7,076 (10)
Municipal debt securities7,031 (9)2,505 (6)
Total$40,984 $(52)$9,581 $(16)
Debt Securities, Available-for-sale Investment Maturities.    The following table summarizes the amortized cost and estimated fair value of the AFS securities within our investment portfolio based on stated maturities as of September 24, 2021 and September 25, 2020, which are recorded within cash equivalents and both short and long-term investments in our consolidated balance sheets (in thousands):
September 24, 2021September 25, 2020
Range of maturityAmortized CostFair ValueAmortized CostFair Value
Due within 1 year$273,884 $274,037 $351,385 $351,582 
Due in 1 to 2 years40,739 40,874 29,799 30,006 
Due in 2 to 3 years15,506 15,490 18,749 18,713 
Total$330,129 $330,401 $399,933 $400,301