Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Earnings Per Share Calculations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 21,833	$ 18,222	$ 83,772	$ 69,853
Net income available to participating securities	(29)	(36)	(311)	(125)
Net income available to common shareholders	$ 21,804	$ 18,186	$ 83,461	$ 69,728
Weighted average common shares outstanding - basic	27,259	27,216	27,244	27,237
Incremental share effect from:
Nonparticipating restricted stock	2	2	3	4
Stock-settled stock appreciation rights	26	33	28	27
Weighted average common shares outstanding - diluted	27,287	27,251	27,275	27,268
Net income per common share - basic and diluted	$ 0.80	$ 0.67	$ 3.06	$ 2.56