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Net Income Per Share (Tables)
 12 Months Ended
Jan. 31, 2012
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,
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
Net income
$
285.3

 
$
212.0

 
$
58.0

Denominator:
 
 
 
 
 
Denominator for basic net income per share—weighted average shares
227.7

 
227.6

 
228.7

Effect of dilutive securities
5.6

 
6.6

 
3.4

Denominator for dilutive net income per share
233.3

 
234.2

 
232.1

Basic net income per share
$
1.25

 
$
0.93

 
$
0.25

Diluted net income per share
$
1.22

 
$
0.90

 
$
0.25