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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Summary of Calculation of Weighted Average Number of Shares Outstanding Used in Computing Basic and Diluted Net Income Loss Per Share
The following table summarizes the computation of basic and diluted earnings (loss) per share under the as-converted method:

 
Year Ended September 30,
 
 
2018
 
2017
 
2016
 
 
(In thousands)
Loss available for distribution
 
$
(37,932
)
 
$
(13,378
)
 
$
(49,120
)
 
 
 
 
 
 
 
Weighted average number of shares
 
 
 
 
 
 
Basic shares outstanding
 
25,115

 
24,712

 
24,313

Dilutive effect related to employee stock plans
 
—

 
—

 
—

Diluted shares outstanding
 
25,115

 
24,712

 
24,313

 
 
 
 
 
 
 
Net loss per share - basic
 
$
(1.51
)
 
$
(0.54
)
 
$
(2.02
)
Net loss per share - diluted
 
$
(1.51
)
 
$
(0.54
)
 
$
(2.02
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table summarizes the potential weighted average shares of common stock that were excluded from the determination of our diluted shares outstanding as they were anti-dilutive:

 
 
Year Ended September 30,
 
 
2018
 
2017
 
2016
 
 
(In thousands)
Outstanding stock-based grants
 
334

 
689

 
816

Convertible preferred stock
 
21,021

 
21,021

 
5,629

 
 
21,355

 
21,710

 
6,445