Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 73,409	$ 98,309	$ 77,299
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	85,020	75,001	67,399
Non-cash employee stock compensation expense	5,701	6,507	6,494
Gain on distribution to non-controlling interest	(2,837)	(3,725)	(3,258)
Amortization of debt discount	9,015
Recognized loss on available-for-sale securities	12,121
Restructuring on royalty interests in mineral properties		1,328
Tax benefit of stock-based compensation exercises	(2,966)	(6,348)	(1,325)
Deferred tax expense (benefit)	(11,419)	1,571	(5,136)
Other	100	2,117
Changes in assets and liabilities:
Royalty receivables	3,562	(5,118)	(8,465)
Prepaid expenses and other assets	(12,300)	88	2,247
Accounts payable	113	530	(930)
Foreign withholding taxes payable	15,294	19	205
Income taxes payable (receivable)	(3,127)	(7,179)	5,527
Other liabilities	944	(936)	6,900
Net cash provided by operating activities	172,630	162,164	146,957
Cash flows from investing activities:
Acquisition of royalty interests in mineral properties	(314,262)	(276,683)	(280,009)
Acquisition of available for sale securities			(28,574)
Proceeds on sale of inventory - restricted	4,916	5,514	5,097
Deferred acquisition costs		(11)	(117)
Other	(96)	(176)	(2,660)
Net cash used in investing activities	(309,442)	(271,356)	(306,263)
Cash flows from financing activities:
Net proceeds from debt		457,023	18,532
Repayment of debt		(326,100)	(41,900)
Net proceeds from issuance of common stock	473,771	271,536
Common stock dividends	(43,934)	(29,504)	(22,130)
Distribution to non-controlling interests	(7,412)	(8,810)	(7,158)
Tax benefit of stock-based compensation exercises	2,966	6,348	1,325
Other			(54)
Net cash provided by (used in) financing activities	425,391	370,493	(51,385)
Net increase (decrease) in cash and equivalents	288,579	261,301	(210,691)
Cash and equivalents at beginning of period	375,456	114,155	324,846
Cash and equivalents at end of period	$ 664,035	$ 375,456	$ 114,155