earnings per share (Notes)

12 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Net Income (Loss) Per Share

The following table sets forth the computation for basic and diluted net income (loss) per share (in thousands, except per share amounts): 

	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

^(a) Certain performance-based awards were excluded from the determination of dilutive net income per share as the conditions were not met at the end of the reporting period.

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