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Earnings per Share (Tables)
 6 Months Ended
Mar. 31, 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 (loss) income per share and basic and diluted weighted average shares outstanding are as follows for the three and six months ended March 31, 2016 and 2015 (in thousands, except per share data): 
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2016
 
2015
 
2016
 
2015
Net (loss) income
$
(83,939
)
 
$
2,711

 
$
(88,587
)
 
$
(23
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding used in computing basic earnings per share
68,556

 
67,387

 
68,342

 
67,255

Dilutive restricted stock units
—

 
1,027

 
—

 
—

Weighted average common shares outstanding used in computing diluted earnings per share
68,556

 
68,414

 
68,342

 
67,255

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
(1.22
)
 
$
0.04

 
$
(1.30
)
 
$
—

Diluted net income (loss) per share
$
(1.22
)
 
$
0.04

 
$
(1.30
)
 
$
—