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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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]        
Net income $ 38,956 $ 34,511 $ 72,356 $ 62,139
Net income available to participating securities (77) (177) (142) (192)
Net income available to common shareholders $ 38,879 $ 34,334 $ 72,214 $ 61,947
Weighted average common shares outstanding - basic (in shares) 27,366 27,328 27,364 27,324
Incremental share effect from:        
Nonparticipating restricted stock (in shares) 3 3 4 4
Stock-settled stock appreciation rights (in shares) 72 43 67 31
Weighted average common shares outstanding - diluted (in shares) 27,441 27,374 27,435 27,359
Net income per common share - basic (in dollars per share) $ 1.42 $ 1.26 $ 2.64 $ 2.27
Net income per common share - diluted (in dollars per share) $ 1.42 $ 1.25 $ 2.63 $ 2.26