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