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																12 Months Ended
	Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2011
Summary Of Significant Accounting Policies [Abstract]
Net income	$ 25,477		$ 21,833		$ 35,277		$ 26,662		$ 25,955		$ 18,222		$ 30,373	[1]	$ 21,258		$ 109,249		$ 95,808		$ 106,364
Net income available to participating securities																	(326)		(177)		(146)
Net income available to common shareholders																	$ 108,923		$ 95,631		$ 106,218
Weighted average common shares outstanding - basic																	27,252		27,233		27,664
Incremental share effect from:
Nonparticipating restricted stock																	3		4		5
Stock-settled stock appreciation rights																	30		28		20
Weighted average common shares outstanding - diluted																	27,285		27,265		27,689
Net income per common share - basic																	$ 4.00		$ 3.51		$ 3.84
Net income per common share - diluted	$ 0.93	[2]	$ 0.80	[2]	$ 1.28	[2]	$ 0.98	[2]	$ 0.95	[2]	$ 0.67	[2]	$ 1.11	[1],[2]	$ 0.78	[2]	$ 3.99	[2]	$ 3.51	[2]	$ 3.84

[1] Included in the second quarter earnings is income of approximately $1.8 million, net of taxes, or approximately $.06 per share, related to funds received under CDSOA.

[2] Diluted net income per share amounts are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly net income per share amounts may not agree with the fiscal year.