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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
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Accounting Policies [Abstract]      
Net income $ 158,613 $ 111,286 $ 89,586
Net income available to participating securities (413) (257) (224)
Net income available to common shareholders $ 158,200 $ 111,029 $ 89,362
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average common shares outstanding - basic (in shares) 27,440 27,462 27,448
Weighted average common shares outstanding - diluted (in shares) 27,461 27,482 27,472
Net income per common share - basic (in dollars per share) $ 5.77 $ 4.04 $ 3.26
Net income per common share - diluted (in dollars per share) $ 5.76 $ 4.04 $ 3.25
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) 2 2 2
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) 6 15 21
Weighted average number of antidilutive securities (in rights outstanding)   100 300
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incremental share effect from awards with forfeitable dividends (in shares) 13 3 1