Net Income Per Share (Tables)

3 Months Ended

Apr. 30, 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 April 30,	2013		2012
Net income attributable to Mentor Graphics shareholders	$	205	$	28,182
Noncontrolling interest adjustment to redemption value	468		—
Adjusted net income attributable to Mentor Graphics shareholders	$	673	$	28,182
Weighted average common shares used to calculate basic net income per share	112,711		109,907
Employee stock options, restricted stock units, and employee stock purchase plan	3,040		3,336
Weighted average common and potential common shares used to calculate diluted net income per share	115,751		113,243
Net income per share attributable to Mentor Graphics shareholders:
Basic	$	0.01	$	0.26
Diluted	$	0.01	$	0.25