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Earnings Per Share (Tables)
 12 Months Ended
Sep. 30, 2018
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, 2018, 2017 and 2016 (in thousands, except per share data):  
 
Year Ended September 30,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income (loss)
$
(7,152
)
 
$
(9,486
)
 
$
15,510

Denominator:
 
 
 
 
 
Weighted average basic shares
11,507

 
11,453

 
11,400

Dilutive effect of restricted stock units
—

 
—

 
31

Weighted average diluted shares with assumed conversions
11,507

 
11,453

 
11,431

 
 
 
 
 
 
Net earnings (loss) per share:
 
 
 
 
 
Basic earnings (loss) per share
$
(0.62
)
 
$
(0.83
)
 
$
1.36

Diluted earnings (loss) per share
$
(0.62
)
 
$
(0.83
)
 
$
1.36