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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
Sep. 30, 2024
Sep. 30, 2023
Accounting Policies [Abstract]    
Net income $ 44,701 $ 43,951
Net income available to participating securities (124) (136)
Net income available to common shareholders $ 44,577 $ 43,815
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average common shares outstanding - basic (in shares) 27,457 27,449
Weighted average common shares outstanding - diluted (in shares) 27,478 27,473
Net income per common share - basic (in dollars per share) $ 1.62 $ 1.60
Net income per common share - diluted (in dollars per share) $ 1.62 $ 1.59
Nonparticipating Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incremental share effect from awards with forfeitable dividends (in shares) 4 3
Stock Settled Stock Appreciation Rights SARS [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incremental share effect from stock-settled stock appreciation rights (in shares) 3 11
Weighted average number of antidilutive securities (in rights outstanding)   100
Performance Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incremental share effect from awards with forfeitable dividends (in shares) 14 10