Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net earnings	$ 84,599	$ 39,446	$ 149,716	$ 117,657
Denominator:
Basic shares outstanding	60,056	60,506	59,843	62,052
Dilutive effect of stock options and restricted stock	1,535	1,582	1,407	1,885
Diluted shares outstanding	61,591	62,088	61,250	63,937
Income per common share:
Basic earnings per share	$ 1.41	$ 0.65	$ 2.50	$ 1.90
Diluted earnings per share	$ 1.37	$ 0.64	$ 2.44	$ 1.84