Net Income (Loss) Per Share (Tables)

12 Months Ended

Jan. 31, 2012

Computation of Basic and Diluted Net Income (loss) Per Share

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


Year ended January 31,	2012		2011		2010
Net income (loss) attributable to Mentor Graphics shareholders	$	83,872	$	28,584	$	(21,889	)

Weighted average common shares used to calculate basic net income (loss) per share		110,138		107,743		96,474
Employee stock options, restricted stock units, and employee stock purchase plans		2,777		2,118		—

Weighted average common and potential common shares used to calculate diluted net income (loss) per share		112,915		109,861		96,474

Net income (loss) per share attributable to Mentor Graphics shareholders:
Basic	$	0.76	$	0.27	$	(0.23	)

Diluted	$	0.74	$	0.26	$	(0.23	)

Floating Rate Debentures, 6.25% Debentures, and 4.00% Debentures had been Dilutive Included Additional Income and Additional Incremental Common Shares

We assume that the 6.25% Debentures and the 4.00% Debentures will be settled in common stock for purposes of calculating the dilutive effect of the 6.25% Debentures and the 4.00% Debentures. If the Floating Rate Debentures, the 6.25% Debentures, and the 4.00% Debentures had been dilutive we would have included additional income and additional incremental common shares as shown in the following table:


Year ended January 31,	2012		2011		2010
Floating Rate Debentures
Additional income	$	—	$	—	$	633
Additional incremental common shares		—		—		1,415

Year ended January 31,	2012		2011		2010
6.25% Debentures
Additional income	$	—	$	3,062	$	2,643
Additional incremental common shares ⁽¹⁾		—		—		—

Year ended January 31,	2012		2011		2010
4.00% Debentures
Additional income	$	2,075	$	—	$	—
Additional incremental common shares ⁽¹⁾		—		—		—

⁽¹⁾	Dilutive net income (loss) per share would have included no incremental shares for the years ended January 31, 2012, 2011, or 2010 as the stock price was below the conversion rate.