Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 66,395	$ 286,096
Net loss	(31,541)	(208,483)
Other comprehensive income	(8,407)	(17,731)
Dividends paid	(8,625)	(8,523)
Issuance of common stock	(3,880)	(1,550)
Stock-based compensation expense	5,221	1,521
Balances, end of period	$ 19,163	29,430	$ 29,430
Dividends paid (USD per share)	$ 0.05		$ 0.05
Cumulative Effect
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period		(21,900)
Common stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 323,338	323,338
Balances, end of period	323,338	323,338	$ 323,338
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	68,502	98,748
Issuance of common stock	(58,454)	(30,716)
Stock-based compensation expense	5,221	1,521
Balances, end of period	15,269	69,553	69,553
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	5,201,195	5,438,930
Net loss	(31,541)	(208,483)
Dividends paid	(8,625)	(8,523)
Balances, end of period	5,161,029	5,200,024	5,200,024
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(839,131)	(840,143)
Other comprehensive income	(8,407)	(17,731)
Balances, end of period	(847,538)	(857,874)	(857,874)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(4,687,509)	(4,734,777)
Issuance of common stock	54,574	29,166
Balances, end of period	$ (4,632,935)	$ (4,705,611)	$ (4,705,611)