Net Income (Loss) Per Share (Tables)

6 Months Ended

Jul. 31, 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 per share:

	Three months ended July 31,				Six months ended July 31,
	2012		2011		2012		2011
Net income attributable to Mentor Graphics shareholders	$	18,167	$	4,334	$	46,349	$	1,981
Weighted average common shares used to calculate basic net income per share	109,875		110,027		109,891		110,888
Employee stock options, restricted stock units, and employee stock purchase plan	3,171		2,817		3,187		3,004
Weighted average common and potential common shares used to calculate diluted net income per share	113,046		112,844		113,078		113,892
Basic net income per share attributable to Mentor Graphics shareholders	$	0.17	$	0.04	$	0.42	$	0.02
Diluted net income per share attributable to Mentor Graphics shareholders	$	0.16	$	0.04	$	0.41	$	0.02