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Marketable Securities (Tables)
9 Months Ended
Jun. 26, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
        
CurrentNoncurrent
Available for sale:June 26,
2020
September 27,
2019
June 26,
2020
September 27,
2019
U.S. Treasury and government $53.9  $34.2  $15.4  $20.0  
Corporate bonds and notes257.9  66.2  3.2  5.9  
Municipal bonds35.2  102.9  5.5  1.7  
Total$347.0  $203.3  $24.1  $27.6