Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 47,584	$ 61,548
Income tax expense	$ 6,014	$ 8,175
Effective tax rate	12.60%	13.30%