Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Jun. 30, 2013
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	64,409,078	64,184,036
Exchangeable shares, no par value (in dollars per share)
Exchangeable shares, shares issued	1,806,649	1,806,649
Exchangeable shares, shares redeemed	1,276,221	1,139,420