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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Apr. 30, 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 (loss) per share:
 
 
Three months ended April 30,
 
2014
 
2013
Net income (loss) attributable to Mentor Graphics shareholders
$
(2,551
)
 
$
205

Noncontrolling interest adjustment to redemption value
667

 
468

Adjusted net income (loss) attributable to Mentor Graphics shareholders
$
(1,884
)
 
$
673

Weighted average common shares used to calculate basic net income (loss) per share
114,935

 
112,711

Employee stock options, restricted stock units and employee stock purchase plan
—

 
3,040

Weighted average common and potential common shares used to calculate diluted net income (loss) per share
114,935

 
115,751

Net income (loss) per share attributable to Mentor Graphics shareholders:
 
 
 
Basic net income (loss) per share
$
(0.02
)
 
$
0.01

Diluted net income (loss) per share
$
(0.02
)
 
$
0.01