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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of Weighted Average Common Shares Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share

The calculations of basic and diluted net income (loss) per share and basic and diluted weighted average shares outstanding are as follows for the fiscal years ended September 30, 2017, 2016 and 2015 (in thousands, except per share data):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended September 30, 

 

    

2017

    

2016

    

2015

Net income (loss)

 

$

62,612

 

$

(69,476)

 

$

14,221

 

 

 

 

 

 

 

 

 

 

Weighted average common shares outstanding used in computing basic earnings (losses) per share

 

 

69,575

 

 

68,507

 

 

67,411

Dilutive common stock options and restricted stock units

 

 

910

 

 

 —

 

 

1,138

Weighted average common shares outstanding used in computing diluted earnings (losses) per share

 

 

70,485

 

 

68,507

 

 

68,549

 

 

 

 

 

 

 

 

 

 

Basic net income (loss) per share

 

$

0.90

 

$

(1.01)

 

$
0.21

Diluted net income (loss) per share

 

 

0.89

 

 

(1.01)

 

 
0.21