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Fair Value (Tables)
 6 Months Ended
Mar. 29, 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
March 29, 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)$1,205.4 $1,205.4 $— $— $718.8 $718.5 $0.3 $— 
U.S. Treasury and government securities15.4 7.2 8.2 — 19.2 — 19.2 — 
Corporate bonds and notes 0.5 — 0.5 — — — — — 
Municipal bonds— — — — 0.5 — 0.5 — 
Total assets at fair value$1,221.3 $1,212.6 $8.7 $— $738.5 $718.5 $20.0 $— 
(1) Cash equivalents included in Levels 1 and 2 consist of money market funds 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
March 29, 2024September 29, 2023
Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
1.80% Senior Notes due 2026$498.1 $464.2 $497.7 $444.5 
3.00% Senior Notes due 2031495.5 422.2 495.2 390.4 
Total debt under Senior Notes$993.6 $886.4 $992.9 $834.9