Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Shares	Exchangeable Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings	Treasury Stock	Non-controlling interests
Balance at Jun. 30, 2010	$ 1,433,548	$ 534	$ 71,741	$ 1,284,087	$ (34)	$ 51,862	$ (4,474)	$ 29,832
Balance (in shares) at Jun. 30, 2010		53,324,171	1,630,109				96,675
Issuance of common stock for:
Exchange of exchangeable shares		6	(31,877)	31,871
Exchange of exchangeable shares (in shares)		724,314	(724,314)
Retirement of treasury stock	(29)	(1)		(4,502)			4,474
Retirement of treasury stock (in shares)		(22,245)					(96,675)
Stock-based compensation and related share issuances	8,245	4		8,241
Stock-based compensation and related share issuances (in shares)		205,547
Net income	77,299					71,395		5,904
Other comprehensive income (loss)	88				88
Distribution to non-controlling interests	(8,203)							(8,203)
Dividends declared	(23,253)					(23,253)
Balance at Jun. 30, 2011	1,487,695	543	39,864	1,319,697	54	100,004		27,533
Balance (in shares) at Jun. 30, 2011		54,231,787	905,795
Issuance of common stock for:
Equity offering	267,433	40		267,393
Equity offering (in shares)		4,000,000
Exchange of exchangeable shares		1	(4,708)	4,707
Exchange of exchangeable shares (in shares)		106,969	(106,969)
2019 convertible senior notes, net of tax	47,605			47,605
Stock-based compensation and related share issuances	16,957	2		16,955
Stock-based compensation and related share issuances (in shares)		275,465
Net income	98,309					92,476		5,833
Other comprehensive income (loss)	(13,817)				(13,817)
Distribution to non-controlling interests	(8,396)							(8,396)
Dividends declared	(32,357)					(32,357)
Balance at Jun. 30, 2012	1,863,429	586	35,156	1,656,357	(13,763)	160,123		24,970
Balance (in shares) at Jun. 30, 2012		58,614,221	798,826
Issuance of common stock for:
Equity offering	471,868	53		471,815
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	7,448	2		7,446
Stock-based compensation and related share issuances (in shares)		188,218
Net income	73,409					69,153		4,256
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	$ 2,370,636	$ 642	$ 29,365	$ 2,142,173	$ (4,572)	$ 181,279		$ 21,749
Balance (in shares) at Jun. 30, 2013		64,184,036	667,229