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Fair Value (Tables)
 9 Months Ended
Jul. 02, 2021
Fair Value Disclosures [Abstract]  
Schedule of 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 July 2, 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* $2,845.0 $2,845.0 $— $— $566.7 $561.2 $5.5 $— 
U.S. Treasury and government securities13.8 4.4 9.4 — 134.4 43.2 91.2 — 
Corporate bonds and notes 106.8 — 106.8 — 276.8 — 276.8 — 
Municipal bonds12.5 — 12.5 — 2.1 — 2.1 — 
Total$2,978.1 $2,849.4 $128.7 $— $980.0 $604.4 $375.6 $—