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
	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net earnings	$ 90,044	$ 29,606
Denominator:
Basic shares outstanding	60,021	59,667
Dilutive effect of stock options and restricted stock	1,825	1,261
Diluted shares outstanding	61,846	60,928
Income per common share:
Basic earnings per share	$ 1.5	$ 0.5
Diluted earnings per share	$ 1.46	$ 0.49