Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Shares	Additional Paid-in Capital	Accumulated (Losses) Earnings	Non-controlling Interests	Total
Balance at Jun. 30, 2019	$ 655	$ 2,201,773	$ (65,747)	$ 33,772	$ 2,170,453
Balance (in shares) at Jun. 30, 2019	65,440,492
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		4,936			4,936
Stock-based compensation and related share issuances (in shares)	90,796
Distributions from (to) non-controlling interests		3,720		(777)	2,943
Net income (loss)			199,343	(3,093)	196,250
Dividends declared			(72,463)		(72,463)
Balance at Jun. 30, 2020	$ 655	2,210,429	61,133	29,902	2,302,119
Balance (in shares) at Jun. 30, 2020	65,531,288
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances	$ 1	4,263			4,264
Stock-based compensation and related share issuances (in shares)	19,773
Sale of Peak Gold JV interest		(10,829)		(16,218)	(27,047)
Distributions to non-controlling interests				(1,281)	(1,281)
Net income (loss)			302,532	244	302,776
Dividends declared			(77,416)		(77,416)
Balance at Jun. 30, 2021	$ 656	2,203,863	286,249	12,647	2,503,415
Balance (in shares) at Jun. 30, 2021	65,551,061
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		2,296			2,296
Stock-based compensation and related share issuances (in shares)	13,303
Distributions to non-controlling interests				(669)	(669)
Net income (loss)			138,339	489	138,828
Dividends declared			(42,659)		(42,659)
Balance at Dec. 31, 2021	$ 656	2,206,159	381,929	12,467	2,601,211
Balance (in shares) at Dec. 31, 2021	65,564,364
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		6,964			6,964
Stock-based compensation and related share issuances (in shares)	28,233
Distributions to non-controlling interests				(1,051)	(1,051)
Net income (loss)			238,982	960	239,942
Dividends declared			(93,597)		(93,597)
Balance at Dec. 31, 2022	$ 656	$ 2,213,123	$ 527,314	$ 12,376	$ 2,753,469
Balance (in shares) at Dec. 31, 2022	65,592,597