CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance, beginning at Jun. 30, 2018	$ 38	$ 306,817	$ 306,464	$ (515)	$ (13,889)	$ 598,915
Balance, beginning (in shares) at Jun. 30, 2018	38,257
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	520				521
Shares issued in connection with share-based compensation plans (in shares)	510
Share-based compensation		4,985				4,985
Purchase of treasury stock					(475)	(475)
Other comprehensive loss, net of income tax				(13)		(13)
ASC 606 adjustment, net of tax			(2,282)			(2,282)
Net income (loss)			(275,166)			(275,166)
Balance, ending at Dec. 31, 2018	$ 39	312,322	29,016	(502)	(14,364)	326,511
Balance, ending (in shares) at Dec. 31, 2018	38,767
Balance, beginning at Sep. 30, 2018	$ 39	310,135	16,654	(509)	(14,295)	312,024
Balance, beginning (in shares) at Sep. 30, 2018	38,665
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans		237				237
Shares issued in connection with share-based compensation plans (in shares)	102
Share-based compensation		1,950				1,950
Purchase of treasury stock					(69)	(69)
Other comprehensive loss, net of income tax				(7)		(7)
Net income (loss)			12,362			12,362
Balance, ending at Dec. 31, 2018	$ 39	312,322	29,016	(502)	(14,364)	326,511
Balance, ending (in shares) at Dec. 31, 2018	38,767
Balance, beginning at Jun. 30, 2019	$ 39	317,023	32,075	(615)	(14,481)	334,041
Balance, beginning (in shares) at Jun. 30, 2019	38,970
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	595				596
Shares issued in connection with share-based compensation plans (in shares)	882
Share-based compensation		6,466				6,466
Purchase of treasury stock					(1,823)	(1,823)
Other comprehensive loss, net of income tax				(37)		(37)
Purchase of capped call		(7,072)				(7,072)
Net income (loss)			(7,073)			(7,073)
Balance, ending at Dec. 31, 2019	$ 40	317,012	25,002	(578)	(16,304)	325,172
Balance, ending (in shares) at Dec. 31, 2019	39,852
Balance, beginning at Sep. 30, 2019	$ 40	314,645	19,918	(661)	(15,838)	318,104
Balance, beginning (in shares) at Sep. 30, 2019	39,630
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans		360				360
Shares issued in connection with share-based compensation plans (in shares)	222
Share-based compensation		2,007				2,007
Purchase of treasury stock					(466)	(466)
Other comprehensive loss, net of income tax				(83)		(83)
Net income (loss)			5,084			5,084
Balance, ending at Dec. 31, 2019	$ 40	$ 317,012	$ 25,002	$ (578)	$ (16,304)	$ 325,172
Balance, ending (in shares) at Dec. 31, 2019	39,852