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Income Taxes - (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax benefit	$ 7,280	$ 3,653	$ 1,777
Effective rate of income tax (percentage)	14.00%	15.60%	12.40%
Increase in deferred tax assets		$ 13,500
Operating loss carryforward, foreign		38,000
Deferred tax asset valuation allowances	$ 18,533	$ 4,987

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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