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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