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Marketable Securities
 3 Months Ended
Dec. 26, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
The following reconciles the cost basis to the fair market value of the Company’s equity securities that are classified as available-for-sale: 
Period Ended:
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Other Than Temporary Impairment
 
Fair Value
December 26, 2015
$
2.4

 
$
—

 
$
(0.9
)
 
$
—

 
$
1.5

September 26, 2015
$
16.1

 
$
7.2

 
$
(0.3
)
 
$
(7.8
)
 
$
15.2


In the first quarter of fiscal 2016, the Company sold all of its shares in one of its marketable securities and recorded a realized gain of $25.1 million in Other income (expense), net.
In the fourth quarter of fiscal 2015, the Company concluded that the decline in fair value of one of its marketable securities was other-than-temporary based on the length of time the security's market value was significantly below its carrying value and recorded an impairment charge of $7.8 million.