Income Taxes - Components of (Benefit from) Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ 2,427	$ (1,323)	$ (791)	$ (1,814)
Foreign	(9,145)	1,303	(2,925)	2,332
(Benefit from) provision for income taxes	$ (6,718)	$ (20)	$ (3,716)	$ 518
Effective income tax rate	(116.30%)	(4.60%)	124.60%	16.10%

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

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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from 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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