Income Taxes - Additional information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Estimated annual effective rate, percent	(47.60%)		(47.60%)
Income (loss) before taxes	$ 15,911	$ 77,223	$ (89,029)	$ 83,679
Income tax expense	$ 67,224	$ 15,223	$ 36,837	$ 15,389
Effective income tax rate reconciliation (percent)	422.50%	19.70%	(41.40%)	18.40%