Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 26, 2021	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Provision for deferred income taxes	$ 13,600	$ 13,088	$ 0	$ 12,938	$ 0