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Fair Value (Tables)
 12 Months Ended
Oct. 02, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):         
As of October 2, 2020As of September 27, 2019
Fair Value MeasurementsFair Value Measurements
Total
Level 1
Level 2
Level 3
Total
Level 1
Level 2
Level 3
Assets
Cash and cash equivalents*$566.7 $561.2 $5.5 $— $851.3 $809.5 $41.8 $— 
U.S. Treasury and government securities 134.4 43.2 91.2 — 54.2 28.4 25.8 — 
Corporate bonds and notes276.8 — 276.8 — 72.1 — 72.1 — 
Municipal bonds2.1 — 2.1 — 104.6 — 104.6 — 
Total$980.0 $604.4 $375.6 $— $1,082.2 $837.9 $244.3 $— 
* 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.