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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net earnings	$ 66,107	$ 49,117	$ 192,806	$ 105,866
Denominator:
Basic shares outstanding	61,941	61,608	61,977	61,417
Dilutive effect of stock options and restricted stock units	2,692	2,273	2,460	2,365
Diluted shares outstanding	64,633	63,881	64,437	63,782
Income per common share:
Basic earnings per share	$ 1.07	$ 0.80	$ 3.11	$ 1.72
Diluted earnings per share	$ 1.02	$ 0.77	$ 2.99	$ 1.66