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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Oct. 31, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted net income (loss) 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,
 
2014
 
2013
 
2014
 
2013
Net income attributable to Mentor Graphics shareholders
$
21,030

 
$
25,535

 
$
32,651

 
$
49,722

Noncontrolling interest adjustment to redemption value
(267
)
 
(2,032
)
 
1,295

 
(3,913
)
Adjusted net income attributable to Mentor Graphics shareholders
$
20,763

 
$
23,503

 
$
33,946

 
$
45,809

Weighted average common shares used to calculate basic net income per share
114,405

 
113,986

 
114,399

 
113,232

Employee stock options, restricted stock units and employee stock purchase plan
2,310

 
3,092

 
2,529

 
3,163

Weighted average common and potential common shares used to calculate diluted net income per share
116,715

 
117,078

 
116,928

 
116,395

Net income per share attributable to Mentor Graphics shareholders:
 
 
 
 
 
 
 
Basic net income per share
$
0.18

 
$
0.21

 
$
0.30

 
$
0.40

Diluted net income per share
$
0.18

 
$
0.20

 
$
0.29

 
$
0.39