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Net Income Per Share (Tables)
 3 Months Ended
Apr. 30, 2012
Notes to Financial Statements [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:

 
Three Months Ended April 30,
 
2012
 
2011
Numerator:
 
 
 
Net income
$
78.9

 
$
69.3

Denominator:
 
 
 
Denominator for basic net income per share—weighted average shares
228.1

 
228.2

Effect of dilutive securities
6.0

 
8.9

Denominator for dilutive net income per share
234.1

 
237.1

Basic net income per share
$
0.35

 
$
0.30

Diluted net income per share
$
0.34

 
$
0.29