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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net earnings	$ 102,075	$ 84,599	$ 289,675	$ 149,716
Denominator:
Basic shares outstanding	60,425	60,056	60,290	59,843
Dilutive effect of stock options and restricted stock	2,097	1,535	2,005	1,407
Diluted shares outstanding	62,522	61,591	62,295	61,250
Income per common share:
Basic earnings per share	$ 1.69	$ 1.41	$ 4.8	$ 2.5
Diluted earnings per share	$ 1.63	$ 1.37	$ 4.65	$ 2.44