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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Apr. 30, 2012
Notes To Financial Statements [Abstract]  
Computation of Basic and Diluted Net Loss Per Share
The following provides the computation of basic and diluted net income (loss) per share:
 
Three months ended April 30,
2012
 
2011
Net income (loss) attributable to Mentor Graphics shareholders
$
28,182

 
$
(2,353
)
Weighted average common shares used to calculate basic net income (loss) per share
109,907

 
111,769

Employee stock options, restricted stock units, and employee stock purchase plan
3,336

 
—

Weighted average common and potential common shares used to calculate diluted net income (loss) per share
113,243

 
111,769

Basic net income (loss) per share attributable to Mentor Graphics shareholders
$
0.26

 
$
(0.02
)
Diluted net income (loss) per share attributable to Mentor Graphics shareholders
$
0.25

 
$
(0.02
)