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Marketable Securities
 3 Months Ended
Dec. 31, 2016
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 31, 2016
$
0.7

 
$
4.0

 
$
(0.3
)
 
$
—

 
$
4.4

September 24, 2016
$
2.4

 
$
—

 
$
(0.3
)
 
$
(1.1
)
 
$
1.0


In the first quarter of fiscal 2017, one of the Company's cost-method equity investments became a marketable security, and the Company recorded the increase in value of $4.0 million to other comprehensive income.

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, net.