Provision For Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Federal Current Tax									$ 48,053	$ 43,334	$ 39,994
State Current Tax									6,022	6,180	6,238
Federal Deferred Tax									20,649	18,276	14,327
State Deferred Tax									1,960	2,251	2,367
Provision for income taxes	$ 17,307	$ 18,461	$ 20,921	$ 19,995	$ 19,650	$ 15,773	$ 16,489	$ 18,129	$ 76,684	$ 70,041	$ 62,926