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Marketable Securities (Tables)
 6 Months Ended
Mar. 27, 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):
    
 
Current
 
Noncurrent
Available for sale:
March 27, 2020
 
September 27,
2019
 
March 27, 2020
 
September 27,
2019
U.S. Treasury and government
$
56.5

 
$
34.2

 
$
27.7

 
$
20.0

Corporate bonds and notes
83.4

 
66.2

 
6.4

 
5.9

Municipal bonds
21.6

 
102.9

 
—

 
1.7

Total
$
161.5

 
$
203.3

 
$
34.1

 
$
27.6