12. Earnings per Share

The calculations of basic and diluted net income per share and basic and diluted weighted average shares outstanding are as follows for the three and six months ended March 31, 2019 and 2018 (in thousands, except per share data):


	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2019		2018		2019		2018
Income (loss) from continuing operations	$	(2,829)	$	62,497	$	3,437	$	64,116
Income from discontinued operations, net of tax		6,250		4,523		14,399		19,390
Net income	$	3,421	$	67,020	$	17,836	$	83,506

Weighted average common shares outstanding used in computing basic earnings per share		72,077		70,220		71,760		70,340
Dilutive restricted stock units		215		393		455		568
Weighted average common shares outstanding used in computing diluted earnings per share		72,292		70,613		72,215		70,908

Basic net income per share attributable to Brooks Automation, Inc. common stockholders:
Income (loss) from continuing operations	$	(0.04)	$	0.89	$	0.05	$	0.91
Income from discontinued operations, net of tax		0.09		0.06		0.20		0.28
Basic net income per share attributable to Brooks Automation, Inc.	$	0.05	$	0.95	$	0.25	$	1.19

Diluted net income per share attributable to Brooks Automation, Inc. common stockholders:
Income (loss) from continuing operations	$	(0.04)	$	0.89	$	0.05	$	0.90
Income from discontinued operations, net of tax		0.09		0.06		0.20		0.27
Diluted net income per share attributable to Brooks Automation, Inc. common stockholders	$	0.05	$	0.95	$	0.25	$	1.18
Dividend declared per share	$	0.10	$	0.10	$	0.20	$	0.20

During the three and the six months ended March 31, 2019, antidilutive restricted stock units of 4,599 and 8,751, respectively, were excluded from the computation of diluted earnings per share based on the treasury stock method. During the three and the six months ended March 31, 2018, antidilutive restricted stock units of 190,517 and 190,266, respectively, were excluded from the computation of diluted earnings per share based on the treasury stock method.