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Earnings Per Share (Tables)
 12 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table reconciles basic and diluted weighted average shares used in the computation of earnings per share for the years ended September 30, 2017, 2016 and 2015 (in thousands, except per share data):  
 
Year Ended September 30,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income (loss)
$
(9,486
)
 
$
15,510

 
$
9,439

Denominator:
 
 
 
 
 
Weighted average basic shares
11,453

 
11,400

 
11,869

Dilutive effect of restricted stock units
—

 
31

 
39

Weighted average diluted shares with assumed conversions
11,453

 
11,431

 
11,908

 
 
 
 
 
 
Net earnings (loss) per share:
 
 
 
 
 
Basic earnings (loss) per share
$
(0.83
)
 
$
1.36

 
$
0.80

Diluted earnings (loss) per share
$
(0.83
)
 
$
1.36

 
$
0.79