Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Taxes
Effective tax rate (as a percent)	22.00%	27.00%	35.00%	17.00%
Income tax provision (benefit)	$ 3,440	$ (19,784)	$ 6,929	$ (13,538)

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

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Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration