Net Income Per Share (Tables)

9 Months Ended

Oct. 31, 2016

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 October 31,				Nine months ended October 31,
	2016		2015		2016		2015
Net income attributable to Mentor Graphics shareholders	$	41,762	$	14,679	$	31,763	$	36,006
Adjustment to redemption value of noncontrolling interest with redemption feature	—		133		—		258
Adjusted net income attributable to Mentor Graphics shareholders, basic	41,762		14,812		31,763		36,264
Adjustment for convertible debt interest, net of tax to be forfeited upon conversion of 4.00% Debentures	519		—		—		519
Adjusted net income attributable to Mentor Graphics shareholders	$	42,281	$	14,812	$	31,763	$	36,783
Weighted average common shares used to calculate basic net income per share	108,887		117,759		108,442		116,787
Potentially dilutive common shares	5,225		2,382		2,489		5,176
Weighted average common and potentially dilutive common shares used to calculate diluted net income per share	114,112		120,141		110,931		121,963
Net income per share attributable to Mentor Graphics shareholders:
Basic net income per share	$	0.38	$	0.13	$	0.29	$	0.31
Diluted net income per share	$	0.37	$	0.12	$	0.29	$	0.30

We have adjusted the numerator of our basic and diluted net income per share calculation for the three and nine months ended October 31, 2015 for the adjustment of the noncontrolling interest with redemption feature to its calculated redemption value, recorded directly to retained earnings.

Adjustments to Net Income excluded from the computation of diluted EPS

The following details the adjustments to net income excluded from the computation of diluted net income per share:

	Three months ended October 31,				Nine months ended October 31,
	2016		2015		2016		2015
Adjustment for convertible debt interest, net of tax to be forfeited upon conversion of 4.00% Debentures	$	—	$	519	$	519	$	—

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

The following details shares excluded from the computation of diluted net income per share:

	Three months ended October 31,		Nine months ended October 31,
	2016	2015	2016	2015
Shares of common stock for restricted stock units	—	—	1,278	—
Shares of common stock for convertible debt	—	2,695	1,071	—
Total anti-dilutive shares excluded	—	2,695	2,349	—

The stock options and the 4.00% Debentures were determined to be anti-dilutive as a result of applying the treasury stock method.