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Marketable Securities (Tables)
9 Months Ended
Jun. 29, 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:
June 29,
2018
 
September 29,
2017
 
June 29,
2018
 
September 29,
2017
U.S. Treasury and government securities
80.5

 
—

 
4.3

 
—

Corporate bonds and notes
121.4

 
—

 
30.4

 
—

Municipal bonds
163.0

 
—

 
64.1

 
—

Other government securities
19.5

 
—

 
7.5

 
—

Total
384.4

 
—

 
106.3

 
—

Available-for-sale Securities
The Company recorded unrealized gains and losses on sales of available-for-sale marketable securities as follows (in millions):


June 29, 2018
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
U.S. Treasury and government securities

84.8

 
—

 
—

 
84.8

Corporate bonds and notes
151.9

 
—

 
(0.1
)
 
151.8

Municipal bonds
227.2

 
—

 
(0.1
)
 
227.1

Other government securities


27.0

 
—

 
—

 
27.0

Total
490.9

 
—

 
(0.2
)
 
490.7