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, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Net income	$ 43,951	$ 37,592
Net income available to participating securities	(136)	(118)
Net income available to common shareholders	$ 43,815	$ 37,474
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average common shares outstanding - basic (in shares)	27,449	27,450
Weighted average common shares outstanding - diluted (in shares)	27,473	27,458
Net income per common share – basic	$ 1.60	$ 1.37
Net income per common share – diluted	$ 1.59	$ 1.36
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)	3	4
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)	11	0
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)	10	4