Net Income Per Share (Tables)

6 Months Ended

Jul. 31, 2015

Earnings Per Share [Abstract]

Computation of basic and diluted net income (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,
	2015			2014		2015		2014
Net income attributable to Mentor Graphics shareholders	$	31,212		$	14,172	$	21,327	$	11,621
Adjustment to redemption value of non-controlling interest with redemption feature	(144		)	895		125		1,562
Adjusted net income attributable to Mentor Graphics shareholders	$	31,068		$	15,067	$	21,452	$	13,183
Weighted average common shares used to calculate basic net income per share	116,584			113,868		116,296		114,396
Employee stock options, restricted stock units and employee stock purchase plan	2,784			2,683		2,690		2,564
Weighted average common and potential common shares used to calculate diluted net income per share	119,368			116,551		118,986		116,960
Net income per share attributable to Mentor Graphics shareholders:
Basic net income per share	$	0.27		$	0.13	$	0.18	$	0.12
Diluted net income per share	$	0.26		$	0.13	$	0.18	$	0.11

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

If the 4.00% Debentures had been dilutive we would have included additional income and additional incremental shares as shown in the following table:

	Three months ended July 31,				Six months ended July 31,
	2015		2014		2015		2014
Additional income	$	2,075	$	2,075	$	2,075	$	2,075
Additional incremental shares	2,825		521		2,489		538