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Income Taxes - Reconciliation (Details)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of the U.S. federal statutory rate to the effective rate for continuing operations
U.S. statutory rate (as a percent)	21.00%	24.50%	35.00%
Permanent items (as a percent)	(6.80%)	(1.20%)	(0.90%)
State taxes (as a percent)	(0.40%)	0.10%	1.20%
Net foreign rate differential (as a percent)	(0.60%)	(1.30%)	(2.80%)
Unrecognized tax benefits (as a percent)	(1.50%)	(0.50%)	3.51%
Change in valuation allowance (as a percent)	(22.50%)	(31.60%)	(34.80%)
Benefit from new Tax Act (as a percent)	0.00%	51.30%	0.00%
Other (as a percent)	4.20%	3.30%	(0.10%)
Provision for income taxes (as a percent)	(6.60%)	44.60%	1.10%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to unrecognized tax benefits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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