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Net Income Per Share (Tables)
 6 Months Ended
Jul. 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 July 31,
 
Six months ended July 31,
 
2013
 
2012
 
2013
 
2012
Net income attributable to Mentor Graphics shareholders
$
23,982

 
$
18,167

 
$
24,187

 
$
46,349

Noncontrolling interest adjustment to redemption value
(2,349
)
 
—

 
(1,881
)
 
—

Adjusted net income attributable to Mentor Graphics shareholders
$
21,633

 
$
18,167

 
$
22,306

 
$
46,349

Weighted average common shares used to calculate basic net income per share
112,988

 
109,875

 
112,851

 
109,891

Employee stock options, restricted stock units, and employee stock purchase plan
3,307

 
3,171

 
3,163

 
3,187

Weighted average common and potential common shares used to calculate diluted net income per share
116,295

 
113,046

 
116,014

 
113,078

Net income per share attributable to Mentor Graphics shareholders:
 
 
 
 
 
 
 
Basic
$
0.19

 
$
0.17

 
$
0.20

 
$
0.42

Diluted
$
0.19

 
$
0.16

 
$
0.19

 
$
0.41