Investments in Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2010
Other cost investments:
Cost method investment	$ 9,217		$ 8,640
Invesora Nihuiles S.A. [Member]
Other cost investments:
Noncontrolling interest in affiliate (in hundredths)	9.75%	[1]
Cost method investment	3,067	[1]	3,067	[1]
Invesora Diamante S.A. [Member]
Other cost investments:
Noncontrolling interest in affiliate (in hundredths)	8.40%	[2]
Cost method investment	2,906	[2]	2,906	[2]
Norchem [Member]
Equity method investment:
Equity in income (loss) from operating subsidiaries, net of tax	577		455		257
Equity method investment	$ 3,244		$ 2,667
Equity interest in affiliate (in hundredths)	50.00%
Hidroelectica Los Nihuiles S.A. [Member]
Equity method investment:
Equity interest in affiliate (in hundredths)	51.00%
Hidroelectica Diamante S.A. [Member]
Equity method investment:
Equity interest in affiliate (in hundredths)	59.00%

[1] This entity owns a 51% interest in Hidroelectrica Los Nihuiles S.A., which is a hydroelectric company in Argentina.

[2] This entity owns a 59% interest in Hidroelectrica Diamante S.A., which is a hydroelectric company in Argentina.