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Fair Value (Tables)
 12 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
As of September 30, 2022As of October 1, 2021
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)$566.0 $565.7 $0.3 $— $882.9 $882.9 $— $— 
U.S. Treasury and government securities 13.6 3.6 10.0 — 13.6 2.6 11.0 — 
Corporate bonds and notes0.2 — 0.2 — 117.0 — 117.0 — 
Municipal bonds7.0 — 7.0 — 13.7 — 13.7 — 
Total assets at fair value$586.8 $569.3 $17.5 $— $1,027.2 $885.5 $141.7 $— 
(1) Cash equivalents included in Levels 1 and 2 consist of money market funds and corporate bonds and notes, commercial paper, 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 consists of the following (in millions):
As of
September 30,
2022		October 1,
2021
Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
0.90% Senior Notes due 2023$499.2 $488.5 $497.9 $501.0 
1.80% Senior Notes due 2026496.8 431.2 496.0507.5 
3.00% Senior Notes due 2031494.5 377.6 493.9514.6 
Total debt under Senior Notes$1,490.5 $1,297.3 $1,487.8 $1,523.1