Income Taxes - Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense (benefit)	$ (3,173)	$ (2,310)	$ (7,853)	$ (3,860)
Benefit related to stock compensation windfalls			4,500	$ 2,000
Charge to increase the deferred tax liability to reflect a change in the blended state income tax rate that results from the sale of the semiconductor business assets			$ 600