Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Stock	Exchangeable Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest	Total
Balance at Jun. 30, 2012	$ 586	$ 35,156	$ 1,656,357	$ (13,763)	$ 160,123	$ 24,970	$ 1,863,429
Balance (in shares) at Jun. 30, 2012	58,614,221	798,826
Issuance of common stock for:
Equity offering	$ 53		471,815				471,868
Equity offering (in shares)	5,250,000
Exchange of exchangeable shares	$ 1	$ (5,791)	5,790
Exchange of exchangeable shares (in shares)	131,597	(131,597)
Other			765				765
Stock-based compensation and related share issuances	$ 2		7,446				7,448
Stock-based compensation and related share issuances (in shares)	188,218
Net income					69,153	4,256	73,409
Other comprehensive income (loss)				9,191			9,191
Distribution to non-controlling interests						(7,477)	(7,477)
Dividends declared					(47,997)		(47,997)
Balance at Jun. 30, 2013	$ 642	$ 29,365	2,142,173	(4,572)	181,279	21,749	2,370,636
Balance (in shares) at Jun. 30, 2013	64,184,036	667,229
Issuance of common stock for:
Exchange of exchangeable shares	$ 3	$ (12,647)	12,644
Exchange of exchangeable shares (in shares)	287,372	(287,372)
Non-controlling interest assignment			(11,463)			(2,250)	(13,713)
Stock-based compensation and related share issuances	$ 1		4,296				4,297
Stock-based compensation and related share issuances (in shares)	106,993
Net income					62,641	831	63,472
Other comprehensive income (loss)				4,412			4,412
Distribution to non-controlling interests						(2,498)	(2,498)
Dividends declared					(54,049)		(54,049)
Balance at Jun. 30, 2014	$ 646	$ 16,718	2,147,650	(160)	189,871	17,832	2,372,557
Balance (in shares) at Jun. 30, 2014	64,578,401	379,857
Issuance of common stock for:
Exchange of exchangeable shares	$ 3	$ (16,718)	16,715
Exchange of exchangeable shares (in shares)	379,857	(379,857)
Non-controlling interest assignment						45,700	45,700
Stock-based compensation and related share issuances	$ 1		6,278				6,279
Stock-based compensation and related share issuances (in shares)	75,289
Net income					51,965	713	52,678
Other comprehensive income (loss)				(3,132)			(3,132)
Distribution to non-controlling interests						(1,440)	(1,440)
Dividends declared					(56,715)		(56,715)
Balance at Jun. 30, 2015	$ 650		$ 2,170,643	$ (3,292)	$ 185,121	$ 62,805	$ 2,415,927
Balance (in shares) at Jun. 30, 2015	65,033,547