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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net earnings $ 38,465 $ 66,107 $ 183,156 $ 192,806
Denominator:        
Basic shares outstanding 62,309 61,941 62,188 61,977
Dilutive effect of stock options and restricted stock 1,118 2,692 2,085 2,460
Diluted shares outstanding 63,427 64,633 64,273 64,437
Income per common share:        
Basic earnings per share $ 0.62 $ 1.07 $ 2.95 $ 3.11
Diluted earnings per share $ 0.61 $ 1.02 $ 2.85 $ 2.99