SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Cash paid during the period for :
Interest	$ 4,590	$ 5,378	$ 1,815
Income taxes, net of refunds	58,520	37,847	16,630
Non-cash investing and financing activities:
Dividends declared	32,357	23,253	16,339
Acquisition of IRC (with common stock and exchangeable shares)			329,586
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)