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Earnings Per Share (Tables)
 12 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Reconciliation of Weighted Average Shares Outstanding for Calculating Basic and Diluted 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