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Presentation of Financial Information (Tables)
 3 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Earnings Per Share
Earnings per share were calculated as follows: 
 
 
Quarter Ended
 
 
 
December 31,
2017
 
January 1,
2017
 
Basic
 
 
 
 
 
Net income
 
$
47.9

 
$
19.5

 
Weighted-average common shares outstanding
 
116.9

 
114.0

 
Basic earnings per share
 
$
0.41

 
$
0.17

 
 
 
 
 
 
 
Diluted
 
 
 
 
 
Net income
 
$
47.9

 
$
19.5

 
Weighted-average common shares outstanding for basic
 
116.9

 
114.0

 
Dilutive effect of stock awards
 
2.0

 
2.3

 
Weighted-average common shares outstanding on a diluted basis
 
118.9

 
116.3

 
Diluted earnings per share
 
$
0.40

 
$
0.17