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Net Income Per Share (Tables)
 9 Months Ended
Oct. 31, 2013
Earnings Per Share [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,
 
2013
 
2012
 
2013
 
2012
Net income attributable to Mentor Graphics shareholders
$
25,535

 
$
30,641

 
$
49,722

 
$
76,990

Noncontrolling interest adjustment to redemption value
(2,032
)
 
—

 
(3,913
)
 
—

Adjusted net income attributable to Mentor Graphics shareholders
$
23,503

 
$
30,641

 
$
45,809

 
$
76,990

Weighted average common shares used to calculate basic net income per share
113,986

 
111,575

 
113,232

 
110,454

Employee stock options, restricted stock units, and employee stock purchase plan
3,092

 
3,146

 
3,163

 
3,130

Weighted average common and potential common shares used to calculate diluted net income per share
117,078

 
114,721

 
116,395

 
113,584

Net income per share attributable to Mentor Graphics shareholders:
 
 
 
 
 
 
 
Basic
$
0.21

 
$
0.27

 
$
0.40

 
$
0.70

Diluted
$
0.20

 
$
0.27

 
$
0.39

 
$
0.68