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Presentation of Financial Information (Tables)
 6 Months Ended
Apr. 02, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Earnings Per Share
Earnings per share were calculated as follows: 
 
 
Quarter Ended
 
Six Months Ended
 
 
April 2,
2017
 
April 3,
2016
 
April 2,
2017
 
April 3,
2016
Basic
 
 
 
 
 
 
 
 
Net income (loss)
 
$
41.2

 
$
(212.0
)
 
$
60.6

 
$
(188.3
)
Weighted-average common shares outstanding
 
114.7

 
109.6

 
114.4

 
102.0

Basic earnings (loss) per share
 
$
0.36

 
$
(1.93
)
 
$
0.53

 
$
(1.85
)
 
 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
 
Net income (loss)
 
$
41.2

 
$
(212.0
)
 
$
60.6

 
$
(188.3
)
Weighted-average common shares outstanding for basic
 
114.7

 
109.6

 
114.4

 
102.0

Dilutive effect of stock awards
 
2.3

 
—

 
2.2

 
—

Weighted-average common shares outstanding on a diluted basis
 
117.0

 
109.6

 
116.6

 
102.0

Diluted earnings (loss) per share
 
$
0.35

 
$
(1.93
)
 
$
0.52

 
$
(1.85
)