Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Jun. 30, 2014
Consolidated Balance Sheets    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 65,029,065 64,578,401
Exchangeable shares, par value (in dollars per share) $ 0 $ 0
Exchangeable shares, shares issued 1,806,649 1,806,649
Exchangeable shares, shares redeemed 1,802,167 1,426,792