Earnings Per Share

12 Months Ended

Sep. 30, 2012

Earnings Per Share

9.    Earnings Per Share

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

	Year Ended September 30,
	2012		2011		2010
Net income attributable to Brooks Automation, Inc.	$	136,789	$	130,385	$	59,841
Weighted average common shares outstanding used in computing basic earnings per share		65,128		64,549		63,777
Dilutive common stock options and restricted stock awards		594		454		397
Weighted average common shares outstanding for purposes of computing diluted earnings per share		65,722		65,003		64,174
Basic net income per share attributable to Brooks Automation, Inc. common stockholders	$	2.10	$	2.02	$	0.94
Diluted net income per share attributable to Brooks Automation, Inc. common stockholders	$	2.08	$	2.01	$	0.93

Approximately 238,000, 387,000 and 888,000 options to purchase common stock and 2,000, 413,000 and 187,000 shares of restricted stock were excluded from the computation of diluted earnings per share attributable to Brooks Automation, Inc. common stockholders for the years ended September 30, 2012, 2011 and 2010, respectively, as their effect would be anti-dilutive.