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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Common Class A [Member]
        
Purchases of Common Stock, Shares 55,052      
Purchases of stock under ESPP, Shares 48,679 28,998 25,781  
Common stock outstanding, Shares 13,865,021 13,862,505 13,862,445 13,862,445
Common Class C [Member]
        
Conversion of shares of class C common stock for class A common stock, Shares 2,516 60    
Common stock outstanding, Shares 2,070,527 2,073,043 2,073,103 2,073,103