Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net (loss) income	$ (82,438)	$ 52,678	$ 63,472
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	141,108	93,486	91,342
Impairment of stream and royalty interests	98,588	31,335
Amortization of debt discount and issuance costs	12,985	12,100	11,332
Non-cash employee stock compensation expense	10,039	5,141	2,580
Tax benefit of stock-based compensation exercises	548	(364)	(597)
(Gain) loss on available-for-sale securities	(2,340)	183	4,499
Deferred tax benefit	(4,983)	(27,651)	(8,166)
Other	(390)	(46)	(259)
Changes in assets and liabilities:
Royalty receivables	17,221	5,977	3,731
Stream inventory	(7,203)	1,110	(3,396)
Income taxes receivable	(14,177)	15,525	(6,183)
Prepaid expenses and other assets	(153)	2,527	11,417
Accounts payable	(849)	150	1,105
Foreign withholding taxes payable	(199)	(2,000)	(13,319)
Uncertain tax positions	1,867	1,405	(7,441)
Other liabilities	235	543	(2,915)
Net cash provided by operating activities	169,859	192,099	147,202
Cash flows from investing activities:
Acquisition of stream and royalty interests	(1,346,109)	(60,429)	(80,019)
Andacollo royalty termination	345,000
Golden Star term loan	(20,000)
Proceeds from sale of available-for-sale securities	11,905
Tulsequah stream termination		10,000
Other	(309)	(773)	(4,782)
Net cash used in investing activities	(1,009,513)	(51,202)	(84,801)
Cash flows from financing activities:
Borrowings from revolving credit facility	350,000
Repayment of revolving credit facility	(75,000)
Net (payments) proceeds from issuance of common stock	(353)	775	1,120
Common stock dividends	(58,720)	(56,054)	(53,380)
Purchase of additional royalty interest from non-controlling interest			(11,522)
Debt issuance costs	(1,111)	(864)	(1,284)
Distribution to non-controlling interests	(830)	(1,805)	(2,431)
Tax (benefit) expense of stock-based compensation exercises	(548)	364	597
Net cash provided by (used in) financing activities	213,438	(57,584)	(66,900)
Net (decrease) increase in cash and equivalents	(626,216)	83,313	(4,499)
Cash and equivalents at beginning of period	742,849	659,536	664,035
Cash and equivalents at end of period	$ 116,633	$ 742,849	$ 659,536