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Fair Value (Tables)
 12 Months Ended
Oct. 01, 2021
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 1, 2021As of October 2, 2020
Fair Value MeasurementsFair Value Measurements
Total
Level 1
Level 2
Level 3
Total
Level 1
Level 2
Level 3
Assets
Cash and cash equivalents*$882.9 $882.9 $— $— $566.7 $561.2 $5.5 $— 
U.S. Treasury and government securities 13.6 2.6 11.0 — 134.4 43.2 91.2 — 
Corporate bonds and notes117.0 — 117.0 — 276.8 — 276.8 — 
Municipal bonds13.7 — 13.7 — 2.1 — 2.1 — 
Total$1,027.2 $885.5 $141.7 $— $980.0 $604.4 $375.6 $— 
* 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.