Consolidated Statement Of Changes In Equity - USD ($) $ in Thousands		Total		Common And Treasury Stock [Member]	Treasury Stock [Member]	Number Of Shares, Net Of Treasury [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	[1]	Accumulated Other Comprehensive Loss [Member]	[1]	Parent [Member]	Noncontrolling Interest [Member]
Balance, Number of Shares at Jun. 30, 2017				81,261,029	(24,891,292)	56,369,737
Balance at Jun. 30, 2017		$ 598,840		$ 80	$ (286,951)		$ 273,733	$ 771,948		$ (162,736)		$ 596,074	$ 2,766
Redeemable Common Stock, Balance at Jun. 30, 2017		107,672
Restricted stock granted, shares				618,411		618,411
Stock-based compensation charge (Note 18)		2,656					2,656					2,656
Reversal of stock-based compensation charge (Note 18)		$ (49)					(49)					(49)
Reversal of stock-based compensation charge (Note 18), shares		(302,223)				(302,223)
Stock based-compensation charge related to equity accounted investment (Note 10)		$ (139)					(139)					(139)
Acquisition of non-controlling interest		94,123											94,123
Net income (loss) (Note 1)		61,207						62,087				62,087	(880)
Other comprehensive loss (Note 1 and Note 16)		$ (21,712)	[1]							(21,614)		(21,614)	(98)
Balance, Number of Shares at Jun. 30, 2018		56,685,925		81,577,217	(24,891,292)	56,685,925
Balance at Jun. 30, 2018		$ 734,926		$ 80	$ (286,951)		276,201	834,035		(184,350)		639,015	95,911
Redeemable Common Stock, Balance at Jun. 30, 2018		107,672
Restricted stock granted, shares				148,000		148,000
Stock-based compensation charge (Note 18)		2,319					2,319					2,319
Reversal of stock-based compensation charge (Note 18)		(1,926)					(1,926)					(1,926)
Reversal of stock-based compensation charge (Note 18), shares				(265,500)		(265,500)
Stock based-compensation charge related to equity accounted investment (Note 10)		117					117					117
Acquisition of non-controlling interest		752					286					286	466
Dividends paid to non-controlling interest		(4,104)											(4,104)
Deconsolidation of DNI (Note 3)		(89,866)											(89,866)
Net income (loss) (Note 1)		(308,658)						(311,007)				(311,007)	2,349
Other comprehensive loss (Note 1 and Note 16)		$ (16,218)	[1]							(11,462)		(11,462)	(4,756)
Balance, Number of Shares at Jun. 30, 2019		56,568,425		81,459,717	(24,891,292)	56,568,425
Balance at Jun. 30, 2019		$ 317,342	[2]	$ 80	$ (286,951)		276,997	523,028		(195,812)		317,342	$ 0
Redeemable Common Stock, Balance at Jun. 30, 2019	[2]	107,672
Restricted stock granted, shares				568,000		568,000
Stock-based compensation charge (Note 18)		1,873					1,873					1,873
Reversal of stock-based compensation charge (Note 18)		(145)					(145)					(145)
Reversal of stock-based compensation charge (Note 18), shares				(17,500)		(17,500)
Stock based-compensation charge related to equity accounted investment (Note 10)		71					71					71
Transfer from redeemable common stock to additional paid-in-capital (Note 16)		22,693					22,693					22,693
Transfer from redeemable common stock to additional paid-in-capital (Note 16)		(22,693)
Net income (loss) (Note 1)		(78,358)						(78,358)				(78,358)
Other comprehensive loss (Note 1 and Note 16)		$ 26,737								26,737		26,737
Balance, Number of Shares at Jun. 30, 2020		57,118,925		82,010,217	(24,891,292)	57,118,925
Balance at Jun. 30, 2020		$ 290,213		$ 80	$ (286,951)		$ 301,489	$ 444,670		$ (169,075)		$ 290,213
Redeemable Common Stock, Balance at Jun. 30, 2020		$ 84,979

[1] Certain amounts have been restated to correct the misstatement discussed in Note 1

[2] Refer to Note 1