Income Taxes - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Provision for deferred income taxes	$ 13,600	$ 4,254	$ 319	$ 17,185	$ 319
Operating loss carryforwards		10,200		10,200
Operating loss carryforwards, not subject to expiration		4,700		4,700
Operating loss carryforwards, subject to expiration		$ 5,500		$ 5,500