Consolidated Statements of Changes in Stockholder's Equity - USD ($) $ in Thousands	Common Shares	Additional Paid-In Capital	Accumulated (Losses) Earnings	Noncontrolling Interests	Total
Balance at Jun. 30, 2020	$ 655	$ 2,210,429	$ 61,133	$ 29,902	$ 2,302,119
Balance (in shares) at Jun. 30, 2020	65,631,288
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances	$ 1	105			106
Stock-based compensation and related share issuances (in shares)	14,318
Sale of Peak Gold JV interest		(10,829)		(16,218)	(27,047)
Distributions to non-controlling interests				(261)	(261)
Net income (loss)			106,939	(265)	106,674
Dividends declared			(18,370)		(18,370)
Balance at Sep. 30, 2020	$ 656	2,199,705	149,702	13,158	2,363,221
Balance (in shares) at Sep. 30, 2020	65,645,606
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		594			594
Stock-based compensation and related share issuances (in shares)	12,741
Distributions to non-controlling interests				(271)	(271)
Net income (loss)			70,176	290	70,466
Dividends declared			(19,691)		(19,691)
Balance at Sep. 30, 2021	$ 656	$ 2,204,457	$ 336,734	$ 12,666	$ 2,554,513
Balance (in shares) at Sep. 30, 2021	65,563,802