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Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Net Income Per Common Share Calculations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]            
Net income $ 44,630 $ 37,079 $ 43,424 $ 40,745 $ 81,709 $ 84,169
Net income available to participating securities (94)   (68)   (173) (133)
Net income available to common shareholders $ 44,536   $ 43,356   $ 81,536 $ 84,036
Weighted average common shares outstanding - basic (in shares) 27,479   27,443   27,470 27,443
Incremental share effect from:            
Nonparticipating restricted stock (in shares) 2   2   3 2
Stock-settled stock appreciation rights (in shares) 37   44   34 58
Weighted average common shares outstanding - diluted (in shares) 27,518   27,489   27,507 27,503
Net income per common share - basic (in dollars per share) $ 1.62   $ 1.58   $ 2.97 $ 3.06
Net income per common share - diluted (in dollars per share) $ 1.62   $ 1.58   $ 2.96 $ 3.06