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Marketable Securities (Tables)
 6 Months Ended
Mar. 26, 2016
Investments, Debt and Equity Securities [Abstract]  
Reconciles Cost Basis to Fair Market Value of Company's Equity Security
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
Six Months Ended March 26, 2016
$
2.4

 
$
—

 
$
(1.5
)
 
$
—

 
$
0.9

Year Ended September 26, 2015
$
16.1

 
$
7.2

 
$
(0.3
)
 
$
(7.8
)
 
$
15.2