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, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 30,373	$ 34,863	$ 51,631	$ 57,630
Net income available to participating securities	(39)	(64)	(66)	(105)
Net income available to common shareholders	$ 30,334	$ 34,799	$ 51,565	$ 57,525
Weighted average common shares outstanding - basic	27,206	27,758	27,248	27,886
Incremental share effect from:
Restricted stock	4	4	5	5
Stock-settled stock appreciation rights	30	23	24	20
Weighted average common shares outstanding - diluted	27,240	27,785	27,277	27,911
Net income per common share - basic and diluted	$ 1.11	$ 1.25	$ 1.89	$ 2.06