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earnings per share Schedules of earnings per share (Tables)
 12 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
Year Ended September 30,
2019
 
2018
 
2017
 
(ASC 606)
 
(ASC 605)
 
(ASC 605)
Numerator:
 
 
 
 
 
Net income (loss) from continuing operations
$
114,338

 
$
(184,904
)
 
$
(178,341
)
Net income from discontinued operations
99,472

 
24,976

 
27,345

Net income (loss)
$
213,810

 
$
(159,928
)
 
$
(150,996
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted average common shares outstanding — Basic
286,347

 
291,318

 
289,348

Dilutive effect of employee stock compensation plans (a)
3,778

 
—

 
—

Weighted average common shares outstanding — Diluted
290,125

 
291,318

 
289,348

 
 
 
 
 
 
Net income (loss) per common share - basic:
 
 
 
 
 
Continuing operations
$
0.40

 
$
(0.63
)
 
$
(0.62
)
Discontinued operations
0.35

 
0.08

 
0.10

Total net income (loss) per basic common share
$
0.75

 
$
(0.55
)
 
$
(0.52
)
 
 
 
 
 
 
Net income (loss) per common share - diluted:
 
 
 
 
 
Continuing operations
$
0.39

 
$
(0.63
)
 
$
(0.62
)
Discontinued operations
0.35

 
0.08

 
0.10

Total net income (loss) per diluted common share
$
0.74

 
$
(0.55
)
 
$
(0.52
)
 
 
 
 
 
 
Anti-dilutive equity instruments excluded from the calculation
1,047

 
528

 
328

Contingently issuable awards excluded from the calculation (a)
1,786

 
4,434

 
1,721