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, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Net income	$ 27,628	$ 22,761
Net income available to participating securities	(35)	(39)
Net income available to common shareholders	$ 27,593	$ 22,722
Weighted average common shares outstanding - basic (in shares)	27,319	27,286
Incremental share effect from:
Nonparticipating restricted stock (in shares)	5	5
Stock-settled stock appreciation rights (in shares)	20	25
Weighted average common shares outstanding - diluted (in shares)	27,344	27,316
Net income per common share - basic and diluted (in dollars per share)	$ 1.01	$ 0.83