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Per Share Data (Tables)
 12 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The calculations of basic and diluted net income (loss) per share for each of the three years ended September 30, 2013, 2012 and 2011 are as follows:
 
Years Ended September 30,
 
2013
 
2012
 
2011
 
(in thousands, except per share data)
Numerator for basic and diluted net income (loss) per share:
 
 
 
 
 
Net income (loss)
$
17,548

 
$
(2,718
)
 
$
55,957

Denominator for basic net income (loss) per share:
 
 
 
 
 
Weighted average common shares outstanding
28,223

 
27,120

 
26,568

Dilutive effect of stock options and awards
1,471

 
—

 
1,740

Denominator for diluted net income (loss) per share
29,694

 
27,120

 
28,308

Basic net income (loss) per share
$
0.62

 
$
(0.10
)
 
$
2.11

Diluted net income (loss) per share
$
0.59

 
$
(0.10
)
 
$
1.98