Consolidated Statements Of Stockholders' Equity (Deficiency) And Comprehensive Income (Loss) - USD ($) $ in Thousands	Total	Common Stock Issued	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at Jun. 30, 2018	$ (657,742)	$ 779	$ 4,067	$ (195,881)	$ (460,007)	$ (6,700)
Increase (Decrease) in Stockholders' Equity (Deficiency) [Roll Forward]
Net income	90,768				90,768
Other comprehensive income	162					162
Comprehensive income	90,930
Share-based compensation expense	9,287		9,287
Tax withholding associated with shares issued for share-based compensation	(4,879)		4,879
Shares issued upon distribution of Restricted Stock Units	0		(7,359)	16,320	(8,961)
Balance at Dec. 31, 2018	(562,032)	779	1,116	(179,561)	(377,828)	(6,538)
Balance at Sep. 30, 2018	(610,224)	779	0	(182,714)	(421,666)	(6,623)
Increase (Decrease) in Stockholders' Equity (Deficiency) [Roll Forward]
Net income	43,838				43,838
Other comprehensive income	85					85
Comprehensive income	43,923
Share-based compensation expense	5,611		5,611
Tax withholding associated with shares issued for share-based compensation	(1,342)		(1,342)
Shares issued upon distribution of Restricted Stock Units	0		(3,153)	3,153	0
Balance at Dec. 31, 2018	(562,032)	779	1,116	(179,561)	(377,828)	(6,538)
Balance at Jun. 30, 2019	(458,768)	779	9,916	(179,561)	(282,414)	(7,488)
Increase (Decrease) in Stockholders' Equity (Deficiency) [Roll Forward]
Net income	83,031				83,031
Other comprehensive income	191					191
Comprehensive income	83,222
Share-based compensation expense	10,099		10,099
Repurchases of Class A Common Stock	253,330			(253,330)
Tax withholding associated with shares issued for share-based compensation	(4,235)		(4,235)
Shares issued upon distribution of Restricted Stock Units	0		(12,130)	15,729	(3,599)
Balance at Dec. 31, 2019	(623,012)	779	3,650	(417,162)	(202,982)	(7,297)
Balance at Sep. 30, 2019	(667,249)	779	0	(417,691)	(242,946)	(7,391)
Increase (Decrease) in Stockholders' Equity (Deficiency) [Roll Forward]
Net income	39,964				39,964
Other comprehensive income	94					94
Comprehensive income	40,058
Share-based compensation expense	5,440		5,440
Repurchases of Class A Common Stock	115			115
Tax withholding associated with shares issued for share-based compensation	(1,376)		(1,376)
Shares issued upon distribution of Restricted Stock Units	0		(414)	414	0
Balance at Dec. 31, 2019	$ (623,012)	$ 779	$ 3,650	$ (417,162)	$ (202,982)	$ (7,297)