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		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 35,277	$ 30,373	$ 61,939	$ 51,631
Net income available to participating securities	(246)	(39)	(299)	(66)
Net income available to common shareholders	$ 35,031	$ 30,334	$ 61,640	$ 51,565
Weighted average common shares outstanding - basic	27,243	27,206	27,236	27,248
Incremental share effect from:
Restricted stock	4	4	4	5
Stock-settled stock appreciation rights	26	30	28	24
Weighted average common shares outstanding - diluted	27,273	27,240	27,268	27,277
Net income per common share - basic	$ 1.29	$ 1.11	$ 2.26	$ 1.89
Net income per common share - diluted	$ 1.28	$ 1.11	$ 2.26	$ 1.89