Net Income Per Share (Tables)

12 Months Ended

Jan. 31, 2015

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,	2015		2014			2013
Net income attributable to Mentor Graphics shareholders	$	147,139	$	155,258		$	138,736
Adjustment to redemption value of non-controlling interest with redemption feature	121		(4,486		)	(5,272		)
Adjusted net income attributable to Mentor Graphics shareholders	$	147,260	$	150,772		$	133,464
Weighted average common shares used to calculate basic net income per share	114,635		113,671			110,998
Employee stock options, restricted stock units and employee stock purchase plan	2,443		3,031			3,019
Weighted average common and potential common shares used to calculate diluted net income per share	117,078		116,702			114,017
Net income per share attributable to Mentor Graphics shareholders:
Basic	$	1.28	$	1.33		$	1.20
Diluted	$	1.26	$	1.29		$	1.17