Stock Repurchase Program (Details) (USD $)	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2011	Jul. 31, 1997	Feb. 28, 2011 February 2011 shares authorized
Stock Repurchase Program
Authorized shares to be repurchased				72,800,000	10,000,000
Unpaid cost of stock repurchases	$ 3,300,000		$ 2,700,000
Shares available for repurchase	7,300,000
Number of shares of common stock repurchased	1,763,000	1,972,000
Total cost of repurchases	$ 66,982,000	$ 59,323,000