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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Mar. 31, 2019
Net Income (Loss) per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation for basic and diluted net income (loss) per share (in thousands, except per share amounts): 
 
Three Months Ended March 31,
 
Six Months Ended March 31,
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net loss from continuing operations
$
(20,749
)
 
$
(167,141
)
 
$
(3,050
)
 
$
(119,676
)
Net income from discontinued operations
98,081

 
3,088

 
99,472

 
8,851

Net income (loss)
$
77,332

 
$
(164,053
)
 
$
96,422

 
$
(110,825
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding — basic
285,866

 
294,103

 
286,849

 
292,720

Dilutive effect of employee stock compensation plans
—

 
—

 
—

 
—

Weighted average common shares outstanding — diluted
285,866

 
294,103

 
286,849

 
292,720

 
 
 
 
 
 
 
 
Net income (loss) per common share - basic:
 
 
 
 
 
 
 
Continuing operations
$
(0.07
)
 
$
(0.57
)
 
$
(0.01
)
 
$
(0.41
)
Discontinued operations
0.34

 
0.01

 
0.35

 
0.03

Total net income (loss) per basic common share
$
0.27

 
$
(0.56
)
 
$
0.34

 
$
(0.38
)
 
 
 
 
 
 
 
 
Net income (loss) per common share - diluted:
 
 
 
 
 
 
 
Continuing operations
$
(0.07
)
 
$
(0.57
)
 
$
(0.01
)
 
$
(0.41
)
Discontinued operations
0.34

 
0.01

 
0.35

 
0.03

Total net income (loss) per diluted common share
$
0.27

 
$
(0.56
)
 
$
0.34

 
$
(0.38
)
 
 
 
 
 
 
 
 
Anti-dilutive equity instruments excluded from the calculation
460

 
2,679

 
635

 
4,178

Contingently issuable awards excluded from the calculation (a)
2,646

 
2,836

 
2,422

 
2,387