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Marketable Securities (Tables)
 12 Months Ended
Oct. 02, 2020
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-sale
The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
    
CurrentNoncurrent
Available-for-sale:October 2,
2020		September 27,
2019		October 2,
2020		September 27,
2019
U.S. Treasury and government$129.4 $34.2 $5.0 $20.0 
Corporate bonds and notes276.8 66.2 — 5.9 
Municipal bonds1.9 102.9 0.2 1.7 
Total$408.1 $203.3 $5.2 $27.6