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Net Income Per Share (Tables)
 12 Months Ended
Jan. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:

 
Fiscal Year Ended January 31,
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Net income
$
228.8

 
$
247.4

 
$
285.3

Denominator:
 
 
 
 
 
Denominator for basic net income per share—weighted average shares
224.0

 
226.4

 
227.7

Effect of dilutive securities
5.6

 
5.3

 
5.6

Denominator for dilutive net income per share
229.6

 
231.7

 
233.3

Basic net income per share
$
1.02

 
$
1.09

 
$
1.25

Diluted net income per share
$
1.00

 
$
1.07

 
$
1.22