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Earnings Per Share (Tables)
 9 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
The following table is a reconciliation of the numerators and denominators in the net income (loss) per common share calculations (in thousands, except per common share data):
 
Three months ended June 30,
 
Nine months ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
2,621

 
$
1,335

 
$
(2,305
)
 
$
5,023

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic net income (loss) per common share — weighted average shares outstanding
27,177

 
26,522

 
27,002

 
26,390

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options and restricted stock units
587

 
434

 
—

 
720

Denominator for diluted net income (loss) per common share — adjusted weighted average shares
27,764

 
26,956

 
27,002

 
27,110

 
 
 
 
 
 
 
 
Net income (loss) per common share, basic
$
0.10

 
$
0.05

 
$
(0.09
)
 
$
0.19

Net income (loss) per common share, diluted
$
0.09

 
$
0.05

 
$
(0.09
)
 
$
0.19