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, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Net income	$ 39,234	$ 35,277	$ 64,035	$ 61,939
Net income available to participating securities	(53)	(246)	(87)	(299)
Net income available to common shareholders	$ 39,181	$ 35,031	$ 63,948	$ 61,640
Weighted average common shares outstanding - basic (in shares)	27,244	27,243	27,256	27,236
Incremental share effect from:
Nonparticipating restricted stock (in shares)	3	4	4	4
Stock-settled stock appreciation rights (in shares)	52	26	46	28
Weighted average common shares outstanding - diluted (in shares)	27,299	27,273	27,306	27,268
Net income per common share - basic (in dollars per share)	$ 1.44	$ 1.29	$ 2.35	$ 2.26
Net income per common share - diluted (in dollars per share)	$ 1.44	$ 1.28	$ 2.34	$ 2.26