Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 120,624	$ 40,241	$ 230,344	$ 71,990
Income tax expense	$ 23,068	$ 4,730	$ 42,744	$ 6,873
Effective tax rate	19.10%	11.80%	18.60%	9.50%