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Presentation of Financial Information (Tables)
 6 Months Ended
Apr. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Earnings Per Share
Earnings per share were calculated as follows: 
 
 
Quarter Ended
 
Six Months Ended
 
 
April 1,
2018
 
April 2,
2017
 
April 1,
2018
 
April 2,
2017
Basic
 
 
 
 
 
 
 
 
Net income
 
$
12.3

 
$
41.2

 
$
60.2

 
$
60.6

Weighted-average common shares outstanding
 
117.4

 
114.7

 
117.2

 
114.4

Basic earnings per share
 
$
0.10

 
$
0.36

 
$
0.51

 
$
0.53

 
 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
 
Net income
 
$
12.3

 
$
41.2

 
$
60.2

 
$
60.6

Weighted-average common shares outstanding for basic
 
117.4

 
114.7

 
117.2

 
114.4

Dilutive effect of stock awards
 
2.2

 
2.3

 
2.1

 
2.2

Weighted-average common shares outstanding on a diluted basis
 
119.6

 
117.0

 
119.3

 
116.6

Diluted earnings per share
 
$
0.10

 
$
0.35

 
$
0.50

 
$
0.52