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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 28, 2026 | Jun. 29, 2025
Fair Value Disclosures [Abstract] |  |
Assets And Liabilities Measured At Fair Value On A Recurring Basis | Assets and liabilities measured at fair value on a recurring basis (in millions):
|  |  | Fair Value Measurements at Reporting Date Using
| Balance at Jun 28, 2026 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 3,449.8 |  |  | $ | 3,449.8 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |
Corporate debt securities | 50.6 |  |  | — |  |  | 38.0 |  |  | 12.6 |
Mortgage and other asset-backed securities | 0.3 |  |  | — |  |  | 0.3 |  |  | — |
State and local government obligations | 2.8 |  |  | — |  |  | 2.8 |  |  | — |
U.S. government treasury securities | 23.1 |  |  | 23.1 |  |  | — |  |  | — |
Total available-for-sale debt securities | 76.8 |  |  | 23.1 |  |  | 41.1 |  |  | 12.6 |
Marketable equity securities | 83.7 |  |  | 83.7 |  |  | — |  |  | — |
Total short-term investments | 160.5 |  |  | 106.8 |  |  | 41.1 |  |  | 12.6 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Derivative assets | 30.1 |  |  | — |  |  | 30.1 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |
Corporate debt securities | 153.2 |  |  | — |  |  | 124.2 |  |  | 29.0 |
Mortgage and other asset-backed securities | 69.2 |  |  | — |  |  | 69.2 |  |  | — |
U.S. government treasury securities | 90.8 |  |  | 90.8 |  |  | — |  |  | — |
Total available-for-sale debt securities | 313.2 |  |  | 90.8 |  |  | 193.4 |  |  | 29.0 |
Total long-term investments | 313.2 |  |  | 90.8 |  |  | 193.4 |  |  | 29.0 |
Other long-term assets: |  |  |  |  |  |  |
Derivative assets | 422.4 |  |  | — |  |  | 422.4 |  |  | — |
Total assets | 4,376.0 |  |  | 3,647.4 |  |  | 687.0 |  |  | 41.6 |
Liabilities: |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Derivative liabilities | 0.8 |  |  | — |  |  | 0.8 |  |  | — |
Other long-term liabilities: |  |  |  |  |  |  |
Derivative liabilities | 19.3 |  |  | — |  |  | 19.3 |  |  | — |
Total liabilities | $ | 20.1 |  |  | $ | — |  |  | $ | 20.1 |  |  | $ | — |
|  |  | Fair Value Measurements at Reporting Date Using
| Balance at Sep 28, 2025 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 3,219.8 |  |  | $ | 3,219.8 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |
Corporate debt securities | 67.8 |  |  | — |  |  | 55.9 |  |  | 11.9 |
Mortgage and other asset-backed securities | 0.4 |  |  | — |  |  | 0.4 |  |  | — |
State and local government obligations | 1.1 |  |  | — |  |  | 1.1 |  |  | — |
U.S. government treasury securities | 82.6 |  |  | 82.6 |  |  | — |  |  | — |
Total available-for-sale debt securities | 151.9 |  |  | 82.6 |  |  | 57.4 |  |  | 11.9 |
Marketable equity securities | 95.3 |  |  | 95.3 |  |  | — |  |  | — |
Total short-term investments | 247.2 |  |  | 177.9 |  |  | 57.4 |  |  | 11.9 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Derivative assets | 15.9 |  |  | — |  |  | 15.9 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |
Corporate debt securities | 132.2 |  |  | — |  |  | 105.5 |  |  | 26.7 |
Mortgage and other asset-backed securities | 75.7 |  |  | — |  |  | 75.7 |  |  | — |
State and local government obligations | 2.7 |  |  | — |  |  | 2.7 |  |  | — |
U.S. government treasury securities | 36.3 |  |  | 36.3 |  |  | — |  |  | — |
Total available-for-sale debt securities | 246.9 |  |  | 36.3 |  |  | 183.9 |  |  | 26.7 |
Total long-term investments | 246.9 |  | 36.3 |  | 183.9 |  | 26.7
Other long-term assets: |  |  |  |  |  |  |
Derivative assets | 278.6 |  |  | — |  |  | 278.6 |  |  | — |
Total assets | 4,008.4 |  |  | 3,434.0 |  |  | 535.8 |  |  | 38.6 |
Liabilities: |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Derivative liabilities | 7.1 |  |  | — |  |  | 7.1 |  |  | — |
Other long-term liabilities: |  |  |  |  |  |  |
Derivative liabilities | 20.9 |  |  | — |  |  | 20.9 |  |  | — |
Total liabilities | $ | 28.0 |  |  | $ | — |  |  | $ | 28.0 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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