Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2016	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Consolidated Quarterly Statements of Operations
Revenues	$ 256,314	$ 253,252	$ 254,872	$ 251,314	$ 238,874	$ 232,864	$ 217,211	$ 228,785	$ 1,015,752	$ 917,734		$ 888,519
Amounts recorded as revenues and school operating expenses	175,863	168,260	160,329	158,985	157,087	148,878	139,163	147,367	663,437	592,495		557,316
Selling, administrative, and other operating expenses	75,207	59,382	60,183	102,578	69,939	62,267	61,958	96,282	297,350	290,446		305,617
Product development expenses	2,563	2,343	1,070	3,503	1,972	2,002	2,376	2,898	9,479	9,248		12,457
Total costs and expenses	253,633	229,985	221,582	265,066	228,998	213,147	203,497	246,547	970,266	892,189		875,390
Income from operations	2,681	23,267	33,290	(13,752)	9,876	19,717	13,714	(17,762)	45,486	25,545		13,129
Interest expense, net and other	1,214	754	477	316	430	261	39	235
Other income (expense), net	154	556	(789)	193					114
Income before income taxes, loss from equity method investments and noncontrolling interest	4,049	24,577	32,978	(13,243)	10,306	19,978	13,753	(17,527)	48,361	26,510		4,937
Income tax benefit (expense), net	(662)	(5,842)	(9,074)	5,058	(959)	(6,935)	(564)	9,368	(10,520)	910		(5,396)		$ (5,396)
Loss from equity method investments	(70)	(273)	(192)	(97)					(632)
Net income (loss)					9,347	13,043	13,189	(8,159)	37,209	27,420		(459)
Add net income (loss) attributable to noncontrolling interest						27	70	103		200		910
Net income attributable to common stockholders	$ 3,317	$ 18,462	$ 23,712	$ (8,282)	$ 9,347	$ 13,070	$ 13,259	$ (8,056)	$ 37,209	$ 27,620	[1]	$ 451	[1]
Net income (loss) attributable to common stockholders per share:
Basic (in dollars per share)	$ 0.08	$ 0.47	$ 0.61	$ (0.22)	$ 0.24	$ 0.33	$ 0.34	$ (0.21)	$ 0.96	$ 0.70		$ 0.01
Diluted (in dollars per share)	$ 0.08	$ 0.44	$ 0.59	$ (0.22)	$ 0.23	$ 0.32	$ 0.33	$ (0.21)	$ 0.91	$ 0.68		$ 0.01
Weighted average shares used in computing per share amounts:
Basic (in shares)	39,135,413	39,008,990	38,816,669	38,434,049	39,031,207	39,644,074	39,347,244	39,108,172	38,848,780	39,282,674		38,298,581
Diluted (in shares)	41,667,000	41,753,323	40,325,260	38,434,049	39,976,593	40,766,203	40,685,667	39,108,172	40,944,800	40,637,744		39,500,934

[1] Net income excludes $0.2 million and $0.9 million for the years ended June 30, 2018 and 2017, respectively, due to the redeemable noncontrolling interest related to Middlebury Interactive Languages and LearnBop, which is reported outside of permanent equity in the accompanying consolidated balance sheets (See Note 9, “Redeemable Noncontrolling Interest”).