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Net Income Per Share (Tables)
 9 Months Ended
Oct. 31, 2012
Notes To Financial Statements [Abstract]  
Computation of Basic and Diluted Net Income Per Share
The following provides the computation of basic and diluted net income per share:
 
 
Three months ended October 31,
 
Nine months ended October 31,
 
2012
 
2011
 
2012
 
2011
Net income attributable to Mentor Graphics shareholders
$
30,641

 
$
24,071

 
$
76,990

 
$
26,052

Weighted average common shares used to calculate basic net income per share
111,575

 
109,501

 
110,454

 
110,423

Employee stock options, restricted stock units, and employee stock purchase plan
3,146

 
2,062

 
3,130

 
2,758

Weighted average common and potential common shares used to calculate diluted net income per share
114,721

 
111,563

 
113,584

 
113,181

Basic net income per share attributable to Mentor Graphics shareholders
$
0.27

 
$
0.22

 
$
0.70

 
$
0.24

Diluted net income per share attributable to Mentor Graphics shareholders
$
0.27

 
$
0.22

 
$
0.68

 
$
0.23