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Fair Value (Tables) | 12 Months Ended
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Sep. 29, 2023
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring Basis |
| As of September 29, 2023 |  | As of September 30, 2022
|  |  | Fair Value Measurements |  |  |  | Fair Value Measurements
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents (1) | $ | 718.8 |  |  | $ | 718.5 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 566.0 |  |  | $ | 565.7 |  |  | $ | 0.3 |  |  | $ | — |
U.S. Treasury and government securities | 19.2 |  |  | — |  |  | 19.2 |  |  | — |  |  | 13.6 |  |  | 3.6 |  |  | 10.0 |  |  | — |
Corporate bonds and notes | — |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Municipal bonds | 0.5 |  |  | — |  |  | 0.5 |  |  | — |  |  | 7.0 |  |  | — |  |  | 7.0 |  |  | — |
Total assets at fair value | $ | 738.5 |  |  | $ | 718.5 |  |  | $ | 20.0 |  |  | $ | — |  |  | $ | 586.8 |  |  | $ | 569.3 |  |  | $ | 17.5 |  |  | $ | — |
(1) Cash equivalents included in Levels 1 and 2 consist of money market funds and corporate bonds and notes, US Treasury and government securities, and agency securities purchased with less than ninety days until maturity.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying amount and estimated fair value of debt under Senior Notes consists of the following (in millions):
| As of
| September 29, 2023 |  | September 30, 2022
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
0.90% Senior Notes due 2023 | $ | — |  |  | $ | — |  |  | $ | 499.2 |  |  | $ | 488.5 |
1.80% Senior Notes due 2026 | 497.7 |  |  | 444.5 |  |  | 496.8 |  | 431.2 |
3.00% Senior Notes due 2031 | 495.2 |  |  | 390.4 |  |  | 494.5 |  | 377.6 |
Total debt under Senior Notes | $ | 992.9 |  |  | $ | 834.9 |  |  | $ | 1,490.5 |  |  | $ | 1,297.3 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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