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Fair Value (Tables)
 6 Months Ended
Mar. 28, 2025
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 28, 2025September 27, 2024
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)$1,387.8 $1,192.6 $195.2 $— $1,368.6 $1,199.1 $169.5 $— 
U.S. Treasury and government securities120.9 99.4 21.5 — 50.1 36.5 13.6 — 
Corporate bonds and notes 19.0 — 19.0 — 155.3 — 155.3 — 
Municipal bonds— — — — 0.1 — 0.1 — 
Total assets at fair value$1,527.7 $1,292.0 $235.7 $— $1,574.1 $1,235.6 $338.5 $— 
(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
March 28, 2025September 27, 2024
Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
1.80% Senior Notes due 2026$499.0 $481.8 $498.5 $478.4 
3.00% Senior Notes due 2031496.1 431.9 495.8 441.2 
Total debt under Senior Notes$995.1 $913.7 $994.3 $919.6