CONDENSED CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Deficit)	Treasury Stock	Total
Balance at Jun. 30, 2018	$ 4	$ 703,351	$ (252)	$ (13,432)	$ (102,482)	$ 587,189
Balance (in shares) at Jun. 30, 2018	44,902,567				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				(8,282)		(8,282)
Foreign currency translation adjustment			72			72
Stock-based compensation expense		4,109				4,109
Exercise of stock options		10				10
Exercise of stock options (in shares)	687
Vesting of performance share units, net of tax withholding (in shares)	258,263
Issuance of restricted stock awards (in shares)	722,809
Forfeiture of restricted stock awards (in shares)	(122,242)
Repurchase of restricted stock for tax withholding		(6,072)				(6,072)
Repurchase of restricted stock for tax withholding (in shares)	(188,804)
Balance at Sep. 30, 2018	$ 4	701,398	(180)	(23,044)	$ (102,482)	575,696
Balance (in shares) at Sep. 30, 2018	45,573,280				(5,334,743)
Balance at Jun. 30, 2018	$ 4	703,351	(252)	(13,432)	$ (102,482)	587,189
Balance (in shares) at Jun. 30, 2018	44,902,567				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)						33,892
Balance at Mar. 31, 2019	$ 4	708,269	(181)	19,130	$ (102,482)	624,740
Balance (in shares) at Mar. 31, 2019	45,542,026				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Adjustment related to new accounting guidance				(1,330)		(1,330)
Balance at Sep. 30, 2018	$ 4	701,398	(180)	(23,044)	$ (102,482)	575,696
Balance (in shares) at Sep. 30, 2018	45,573,280				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				23,712		23,712
Foreign currency translation adjustment			121			121
Stock-based compensation expense		4,235				4,235
Exercise of stock options		1,025				1,025
Exercise of stock options (in shares)	51,050
Issuance of restricted stock awards (in shares)	26,000
Forfeiture of restricted stock awards (in shares)	(54,054)
Repurchase of restricted stock for tax withholding		(833)				(833)
Repurchase of restricted stock for tax withholding (in shares)	(45,960)
Balance at Dec. 31, 2018	$ 4	705,825	(59)	668	$ (102,482)	603,956
Balance (in shares) at Dec. 31, 2018	45,550,316				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				18,462		18,462
Foreign currency translation adjustment			(122)			(122)
Stock-based compensation expense		4,047				4,047
Exercise of stock options		1,148				1,148
Exercise of stock options (in shares)	54,753
Issuance of restricted stock awards (in shares)	73,524
Forfeiture of restricted stock awards (in shares)	(51,435)
Repurchase of restricted stock for tax withholding		(2,751)				(2,751)
Repurchase of restricted stock for tax withholding (in shares)	(85,132)
Balance at Mar. 31, 2019	$ 4	708,269	(181)	19,130	$ (102,482)	624,740
Balance (in shares) at Mar. 31, 2019	45,542,026				(5,334,743)
Balance at Jun. 30, 2019	$ 4	713,436	(40)	22,447	$ (102,482)	633,365
Balance (in shares) at Jun. 30, 2019	45,575,236				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				(9,730)		(9,730)
Foreign currency translation adjustment			139			139
Stock-based compensation expense		5,594				5,594
Exercise of stock options		42				42
Exercise of stock options (in shares)	2,500
Issuance of restricted stock awards (in shares)	918,702
Forfeiture of restricted stock awards (in shares)	(34,090)
Repurchase of restricted stock for tax withholding		(4,698)				(4,698)
Repurchase of restricted stock for tax withholding (in shares)	(171,778)
Balance at Sep. 30, 2019	$ 4	714,374	99	12,717	$ (102,482)	624,712
Balance (in shares) at Sep. 30, 2019	46,290,570				(5,334,743)
Balance at Jun. 30, 2019	$ 4	713,436	(40)	22,447	$ (102,482)	633,365
Balance (in shares) at Jun. 30, 2019	45,575,236				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)						19,618
Balance at Mar. 31, 2020	$ 4	724,992	49	42,065	$ (102,482)	664,628
Balance (in shares) at Mar. 31, 2020	46,274,270				(5,334,743)
Balance at Sep. 30, 2019	$ 4	714,374	99	12,717	$ (102,482)	624,712
Balance (in shares) at Sep. 30, 2019	46,290,570				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				20,594		20,594
Foreign currency translation adjustment			(287)			(287)
Stock-based compensation expense		6,256				6,256
Exercise of stock options		6				6
Exercise of stock options (in shares)	500
Issuance of restricted stock awards (in shares)	18,000
Forfeiture of restricted stock awards (in shares)	(18,019)
Repurchase of restricted stock for tax withholding		(185)				(185)
Repurchase of restricted stock for tax withholding (in shares)	(8,878)
Balance at Dec. 31, 2019	$ 4	720,451	(188)	33,311	$ (102,482)	651,096
Balance (in shares) at Dec. 31, 2019	46,282,173				(5,334,743)
Increase (Decrease) in Stockholders' Equity
Net income (loss)				8,754		8,754
Foreign currency translation adjustment			237			237
Stock-based compensation expense		6,162				6,162
Issuance of restricted stock awards (in shares)	108,959
Forfeiture of restricted stock awards (in shares)	(23,900)
Repurchase of restricted stock for tax withholding		(1,621)				(1,621)
Repurchase of restricted stock for tax withholding (in shares)	(92,962)
Balance at Mar. 31, 2020	$ 4	$ 724,992	$ 49	$ 42,065	$ (102,482)	$ 664,628
Balance (in shares) at Mar. 31, 2020	46,274,270				(5,334,743)