Treasury Stock (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Class of Stock [Line Items]
Treasury stock, remaining number of shares authorized to be repurchased	4,539	5,584
Treasury Stock, Value	$ 343,956	$ 309,585
Treasury Stock, Shares, Acquired	1,045
Treasury Stock
Class of Stock [Line Items]
Treasury Stock, Value	343,956	309,585	309,585	309,585
Purchase of treasury shares	$ (34,371)	$ 0	$ 0