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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2015
Jun. 30, 2014
Consolidated Balance Sheets [Abstract]    
Common stock, shares authorized 200,000,000 200,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 46,679,565 47,819,299
Common stock, shares outstanding 46,679,565 47,819,299
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Treasury shares, shares outstanding 18,057,228 15,883,212