Income Taxes (Tax Expense and Effective Tax Rate) (Details) - 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]
Earnings before income taxes	$ 54,096	$ 78,487	$ 91,842	$ 126,071
Income tax expense	$ 6,190	$ 10,174	$ 13,631	$ 16,188
Effective tax rate	11.40%	13.00%	14.80%	12.80%