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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Exercise of stock options, shares 26,500 32,000 31,900
Employee Stock Purchase Plans, shares 4,395 699  
Open market purchase of treasury shares, shares 886,503    
Other treasury share purchases 52,992 30,154 49,138
Additional Paid-In Capital [Member]
      
Exercise of stock options, shares 26,500 32,000 31,900
Issuance of deferred shares, shares 184,149 126,428 165,291
Employee Stock Purchase Plans, shares 4,395 699  
Retained Earnings [Member]
      
Exercise of stock options, shares 26,500 32,000 31,900
Treasury Stock [Member]
      
Exercise of stock options, shares 26,500 32,000 31,900
Issuance of deferred shares, shares 184,149 126,428 165,291
Employee Stock Purchase Plans, shares 4,395 699  
Open market purchase of treasury shares, shares 886,503    
Other treasury share purchases 52,992 30,154 49,138