Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2011 percent stations segment measures stockclasses	Jun. 30, 2010	Jun. 30, 2009	May 31, 2008
Class of Stock [Line Items]
Number of classes of common stock outstanding	2
Authorized number of shares to be repurchased				2,000,000
Repurchases: Number of shares	768,000	188,000	882,000
Repurchases: Cost at market value	$ 24,895	$ 6,274	$ 21,801
Remaining number of shares to be repurchased	500,000
Common stock [Member]
Class of Stock [Line Items]
Common stock voting rights	one vote per share
Class B stock [Member]
Class of Stock [Line Items]
Common stock voting rights	10 votes per share