Net Income Per Share (Tables)

12 Months Ended

Jan. 31, 2014

Schedule of Earnings Per Share Basic and Diluted [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following provides the computation of basic and diluted net income per share:

Year ended January 31,	2014			2013			2012
Net income attributable to Mentor Graphics shareholders	$	155,258		$	138,736		$	83,872
Noncontrolling interest adjustment to redemption value	(4,486		)	(5,272		)	—
Adjusted net income attributable to Mentor Graphics shareholders	$	150,772		$	133,464		$	83,872
Weighted average common shares used to calculate basic net income per share	113,671			110,998			110,138
Employee stock options, restricted stock units and employee stock purchase plan	3,031			3,019			2,777
Weighted average common and potential common shares used to calculate diluted net income per share	116,702			114,017			112,915
Net income per share attributable to Mentor Graphics shareholders:
Basic	$	1.33		$	1.20		$	0.76
Diluted	$	1.29		$	1.17		$	0.74