Earnings per Share (Tables)

9 Months Ended

Jun. 30, 2018

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 per share and basic and diluted weighted average shares outstanding are as follows for the three and nine months ended June 30, 2018 and 2017 (in thousands, except per share data):

	Three Months Ended				Nine Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Net income	$	22,606	$	17,350	$	106,112	$	45,226
Net loss attributable to noncontrolling interest		111		—		111		—
Net income attributable to Brooks Automation, Inc.	$	22,717	$	17,350	$	106,223	$	45,226
Weighted average common shares outstanding used in computing basic earnings per share		70,596		69,711		70,425		69,496
Dilutive restricted stock units		382		694		508		702
Weighted average common shares outstanding used in computing diluted earnings per share		70,978		70,405		70,933		70,198
Basic net income per share	$	0.32	$	0.25	$	1.51	$	0.65
Diluted net income per share	$	0.32	$	0.25	$	1.50	$	0.64