SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Cash paid during the period for :
Interest	$ 5,378	$ 1,815	$ 391
Income taxes, net of refunds	37,847	16,630	23,303
Non-cash investing and financing activities:
Dividends declared	23,253	16,339	11,117
Acquisition of IRC (with common stock and exchangeable shares)		308,882
Acquisition of royalty interests in mineral properties (with common stock)		53,428
In-kind distribution to CVP partners		6,125
Treasury stock	$ 4,474	$ (3,557)