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Fair Value (Tables)
 12 Months Ended
Sep. 27, 2024
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities Measured on Recurring Basis
Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):
As of
September 27, 2024September 29, 2023
Fair Value MeasurementsFair Value Measurements
Total
Level 1
Level 2
Level 3
Total
Level 1
Level 2
Level 3
Assets
Cash and cash equivalents (1)$1,368.6 $1,199.1 $169.5 $— $718.8 $718.5 $0.3 $— 
U.S. Treasury and government securities50.1 36.5 13.6 — 19.2 — 19.2 — 
Corporate bonds and notes155.3 — 155.3 — — — — — 
Municipal bonds0.1 — 0.1 — 0.5 — 0.5 — 
Total assets at fair value$1,574.1 $1,235.6 $338.5 $— $738.5 $718.5 $20.0 $— 
(1) Cash equivalents included in Levels 1 and 2 consist of money market funds, corporate bonds and notes, and U.S. Treasury and government securities purchased with less than ninety days until maturity.
Carrying Values and Estimated Fair Values of Debt Instruments
The carrying amount and estimated fair value of debt consists of the following (in millions):
As of
September 27, 2024September 29, 2023
Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
1.80% Senior Notes due 2026$498.5 $478.4 $497.7 $444.5 
3.00% Senior Notes due 2031495.8 441.2 495.2 390.4 
Total debt under Senior Notes$994.3 $919.6 $992.9 $834.9