Earnings per Share (Tables)

12 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Common Shares Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share

The calculations of basic and diluted net income (loss) per share and basic and diluted weighted average shares outstanding are as follows for the fiscal years ended September 30, 2019, 2018 and 2017 (in thousands, except per share data):

	Year Ended September 30,
	2019		2018		2017
Income from continuing operations	$	9,554	$	67,717	$	10,687
Income from discontinued operations, net of tax		427,862		48,747		51,925
Net income		437,416		116,464		62,612
Net loss attributable to noncontrolling interest		—		111		—
Net income attributable to Brooks Automation, Inc.	$	437,416	$	116,575	$	62,612
Weighted average common shares outstanding used in computing basic earnings per share		71,992		70,489		69,575
Dilutive restricted stock units		394		448		910
Weighted average common shares outstanding used in computing diluted earnings per share		72,386		70,937		70,485
Basic net income per share attributable to Brooks Automation, Inc. common stockholders:
Income from continuing operations	$	0.13	$	0.96	$	0.15
Income from discontinued operations, net of tax		5.95		0.69		0.75
Basic net income per share attributable to Brooks Automation, Inc.	$	6.08	$	1.65	$	0.90
Diluted net income per share attributable to Brooks Automation, Inc. common stockholders:
Income from continuing operations	$	0.13	$	0.95	$	0.15
Income from discontinued operations, net of tax		5.91		0.69		0.74
Diluted net income per share attributable to Brooks Automation, Inc. common stockholders	$	6.04	$	1.64	$	0.89
Dividend declared per share	$	0.40	$	0.40	$	0.40