Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Beginning Balance			$ 1,961,608	$ 1,812,293
Net (loss) income	(45,551)	51,994	(393,129)	114,719
Other comprehensive (loss) income			(143,824)	34,731
Dividend reinvestment			244	229
Capital stock issued under employee benefit and stock plans			19,950	28,999
Purchase of capital stock			(244)	(14,063)
Cash dividends paid			(42,746)	(42,350)
Ending Balance	1,401,859	1,934,558	1,401,859	1,934,558
Capital stock [Member]
Beginning Balance			98,340	97,303
Dividend reinvestment			7	6
Capital stock issued under employee benefit and stock plans			740	1,241
Purchase of capital stock			(7)	(412)
Ending Balance	99,080	98,138	99,080	98,138
Additional paid-in capital [Member]
Beginning Balance			395,890	374,300
Dividend reinvestment			237	223
Capital stock issued under employee benefit and stock plans			19,210	27,758
Purchase of capital stock			(237)	(13,651)
Ending Balance	415,100	388,630	415,100	388,630
Retained earnings [Member]
Beginning Balance			1,501,157	1,399,227
Net (loss) income			(395,043)	112,911
Cash dividends paid			(42,699)	(42,285)
Ending Balance	1,063,415	1,469,853	1,063,415	1,469,853
Accumulated other comprehensive (loss) income [Member]
Beginning Balance			(66,131)	(89,004)
Other comprehensive (loss) income			(140,287)	34,184
Ending Balance	(206,418)	(54,820)	(206,418)	(54,820)
Non-controlling interest [Member]
Beginning Balance			32,352	30,467
Net (loss) income			1,914	1,808
Other comprehensive (loss) income			(3,537)	547
Cash dividends paid			(47)	(65)
Ending Balance	$ 30,682	$ 32,757	$ 30,682	$ 32,757