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, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 18,222	$ 19,441	$ 69,853	$ 77,071
Net income available to participating securities	(36)	(25)	(125)	(109)
Net income available to common shareholders	$ 18,186	$ 19,416	$ 69,728	$ 76,962
Weighted average common shares outstanding - basic	27,216	27,494	27,237	27,755
Incremental share effect from:
Restricted stock	2	3	4	5
Stock-settled stock appreciation rights	33	23	27	21
Weighted average common shares outstanding - diluted	27,251	27,520	27,268	27,781
Net income per common share - basic and diluted	$ 0.67	$ 0.71	$ 2.56	$ 2.77