Earnings (Loss) Per Share (Tables)

12 Months Ended

Sep. 30, 2011

Reconciliation of Weighted Average Shares Outstanding for Calculating Basic and Diluted Earnings (Loss) Per Share

Below is a reconciliation of weighted average common shares outstanding for purposes of calculating basic and diluted earnings (loss) per share (in thousands, except per share data):

	Year Ended September 30,
	2011		2010		2009
Net income (loss) attributable to Brooks Automation, Inc.	$	128,352	$	58,982	$	(227,858	)
Weighted average common shares outstanding used in computing basic earnings (loss) per share		64,549		63,777		62,911
Dilutive common stock options and restricted stock awards		454		397		—
Weighted average common shares outstanding for purposes of computing diluted earnings (loss) per share		65,003		64,174		62,911
Basic net income (loss) per share attributable to Brooks Automation, Inc. common stockholders	$	1.99	$	0.92	$	(3.62	)
Diluted net income (loss) per share attributable to Brooks Automation, Inc. common stockholders	$	1.97	$	0.92	$	(3.62	)