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Marketable Securities (Tables)
 3 Months Ended
Dec. 28, 2018
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:
December 28,
2018
 
September 28,
2018
 
December 28,
2018
 
September 28,
2018
U.S. Treasury and government
$
7.9

 
$
65.0

 
$
—

 
$
—

Corporate bonds and notes
1.4

 
204.1

 
—

 
12.0

Municipal bonds
2.2

 
2.0

 
2.7

 
0.8

Other government
1.9

 
23.0

 
—

 
10.0

Total
$
13.4

 
$
294.1

 
$
2.7

 
$
22.8