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Presentation of Financial Information (Tables)
 9 Months Ended
Jul. 02, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Earnings Per Share
Earnings per share were calculated as follows: 
 
 
Quarter Ended
 
Nine Months Ended
 
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
Basic
 
 
 
 
 
 
 
 
Net income (loss)
 
$
13.6

 
$
115.2

 
$
74.3

 
$
(73.1
)
Weighted-average common shares outstanding
 
115.0

 
112.1

 
114.7

 
105.3

Basic earnings (loss) per share
 
$
0.12

 
$
1.03

 
$
0.65

 
$
(0.69
)
 
 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
 
Net income (loss)
 
$
13.6

 
$
115.2

 
$
74.3

 
$
(73.1
)
Weighted-average common shares outstanding for basic
 
115.0

 
112.1

 
114.7

 
105.3

Dilutive effect of stock awards
 
2.2

 
2.5

 
2.1

 
—

Weighted-average common shares outstanding on a diluted basis
 
117.2

 
114.6

 
116.8

 
105.3

Diluted earnings (loss) per share
 
$
0.12

 
$
1.00

 
$
0.64

 
$
(0.69
)