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Earnings per Share (EPS) and Common Stock (Tables)
 6 Months Ended
Mar. 31, 2018
Earnings Per Share and Common Stock  
Earnings(loss) per Share Basic and Diluted
 
Three months ended
 
Six months ended
Calculation of Basic and Diluted EPS
March 31,
2018
 
April 1,
2017
 
March 31,
2018
 
April 1,
2017
 
(in thousands, except per share data)
Net income (loss)
$
7,922

 
$
(1,104
)
 
$
21,799

 
$
(10,245
)
Weighted average shares outstanding—Basic
116,241

 
115,709

 
115,986

 
115,498

Dilutive effect of restricted stock units
1,664

 
—

 
1,794

 
—

Weighted average shares outstanding—Diluted
117,905

 
115,709

 
117,780

 
115,498

Earnings (loss) per share—Basic
$
0.07

 
$
(0.01
)
 
$
0.19

 
$
(0.09
)
Earnings (loss) per share—Diluted
$
0.07

 
$
(0.01
)
 
$
0.19

 
$
(0.09
)