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Investments (Tables)
 12 Months Ended
Jun. 27, 2015
Investments, Debt and Equity Securities, Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Unrealized Gains (Losses) on Available for Sale Securities
Net unrealized investment gains (losses) on available for sale securities were as follows (in millions):
 
Fiscal Year
 
2015
 
2014
Net unrealized investment gains (losses):
 
 
 
Equity securities, at cost less impairments
$
17.1

 
$
17.1

Gross unrealized gains
5.7

 
3.8

Gross unrealized losses
(10.1
)
 
(0.2
)
Estimated fair value of equity securities
$
12.7

 
$
20.7