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 at Jun. 30, 2017	$ 37	$ 292,780	$ 277,774	$ (222)	$ (9,247)	$ 561,122
Balance (in shares) at Jun. 30, 2017	37,528
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	313				314
Shares issued in connection with share-based compensation plans (in shares)	144
Share-based compensation		2,189				2,189
Purchase of treasury stock					(612)	(612)
Other comprehensive income, net of tax				1		1
Net income (loss)			13,257			13,257
Balance at Sep. 30, 2017	$ 38	295,282	291,031	(221)	(9,859)	576,271
Balance (in shares) at Sep. 30, 2017	37,672
Balance at Jun. 30, 2018	$ 38	306,817	306,464	(515)	(13,889)	598,915
Balance (in shares) at Jun. 30, 2018	38,257
Increase (Decrease) in Shareholders' Equity
Shares issued in connection with share-based compensation plans	$ 1	283				284
Shares issued in connection with share-based compensation plans (in shares)	408
Share-based compensation		3,035				3,035
Purchase of treasury stock					(406)	(406)
Other comprehensive income, net of tax				6		6
Net income (loss)			(287,528)			(287,528)
Balance at Sep. 30, 2018	$ 39	$ 310,135	16,653	$ (509)	$ (14,295)	312,023
Balance (in shares) at Sep. 30, 2018	38,665
Increase (Decrease) in Shareholders' Equity
ASC 606 adjustment, net of tax | ASU 2014-09			$ (2,283)			$ (2,283)