Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 58,698	$ 45,016	$ 184,769	$ 213,763
Income tax expense	$ 9,837	$ 6,551	$ 26,025	$ 30,607
Effective tax rate	16.80%	14.60%	14.10%	14.30%