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Earnings per Share
 12 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Earnings per Share
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,
 
2013
 
2012
 
2011
Net (loss) income attributable to Brooks Automation, Inc.
$
(2,215
)
 
$
136,789

 
$
130,385

Weighted average common shares outstanding used in computing basic earnings per share
65,912

 
65,128

 
64,549

Dilutive common stock options and restricted stock awards
—

 
594

 
454

Weighted average common shares outstanding used in computing diluted earnings per share
65,912

 
65,722

 
65,003

Basic net (loss) income per share attributable to Brooks Automation, Inc. common stockholders
$
(0.03
)
 
$
2.10

 
$
2.02

Diluted net (loss) income per share attributable to Brooks Automation, Inc. common stockholders
$
(0.03
)
 
$
2.08

 
$
2.01


Options to purchase approximately 43,000, 238,000 and 387,000 shares of common stock and 3,006,000, 2,000 and 413,000 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, 2013, 2012 and 2011, respectively, as their effect would be anti-dilutive. All outstanding stock options and unvested shares of restricted stock were excluded from the computation of diluted earnings per share for the year ended September 30, 2013 as a result of the net loss for that period.