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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 2016
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 three and nine months ended June 30, 2016 and 2015 (in thousands, except per share data): 
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Net income (loss)
$
8,564

 
$
7,681

 
$
(80,022
)
 
$
7,658

 
 
 
 
 
 
 
 
Weighted average common shares outstanding used in computing basic earnings (losses) per share
68,628

 
67,454

 
68,437

 
67,321

Dilutive restricted stock units
538

 
1,117

 
—

 
1,199

Weighted average common shares outstanding used in computing diluted earnings (losses) per share
69,166

 
68,571

 
68,437

 
68,520

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
0.12

 
$
0.11

 
$
(1.17
)
 
$
0.11

Diluted net income (loss) per share
$
0.12

 
$
0.11

 
$
(1.17
)
 
$
0.11