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Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Consolidated Quarterly Statements of Operations
Revenues	$ 268,931	$ 257,154	$ 257,559	$ 257,121	$ 256,314	$ 253,252	$ 254,872	$ 251,314	$ 1,040,765	$ 1,015,752	$ 917,734
Instructional costs and services	177,436	178,968	167,470	169,358	175,863	168,260	160,329	158,985	693,232	663,437	592,495
Gross margin	91,495	78,186	90,089	87,763	80,451	84,992	94,543	92,329	347,533	352,315	325,239
Selling, general, and administrative expenses	84,454	63,687	59,784	107,151	77,770	61,725	61,253	106,081	315,076	306,829	299,694
Income from operations	7,041	14,499	30,305	(19,388)	2,681	23,267	33,290	(13,752)	32,457	45,486	25,545
Interest income, net	(577)	(76)	441	910	1,214	754	477	316	698	2,761	965
Other income (expense), net	1,008	(1,093)	365	(8)	154	556	(789)	193	272	114
Income before income taxes and loss from equity method investments	7,472	13,330	31,111	(18,486)	4,049	24,577	32,978	(13,243)	33,427	48,361	26,510
Income tax benefit (expense), net	(2,548)	(4,419)	(10,392)	8,818	(662)	(5,842)	(9,074)	5,058	(8,541)	(10,520)	910
Loss from equity method investments	(36)	(157)	(125)	(62)	(70)	(273)	(192)	(97)	(380)	(632)
Net income attributable to common stockholders	$ 4,888	$ 8,754	$ 20,594	$ (9,730)	$ 3,317	$ 18,462	$ 23,712	$ (8,282)	$ 24,506	$ 37,209	$ 27,620
Net income (loss) attributable to common stockholders per share:
Basic (in dollars per share)	$ 0.12	$ 0.22	$ 0.52	$ (0.25)	$ 0.08	$ 0.47	$ 0.61	$ (0.22)	$ 0.62	$ 0.96	$ 0.70
Diluted (in dollars per share)	$ 0.12	$ 0.22	$ 0.52	$ (0.25)	$ 0.08	$ 0.44	$ 0.59	$ (0.22)	$ 0.60	$ 0.91	$ 0.68
Weighted average shares used in computing per share amounts:
Basic (in shares)	39,637,347	39,539,791	39,450,017	39,288,557	39,135,413	39,008,990	38,816,669	38,434,049	39,478,928	38,848,780	39,282,674
Diluted (in shares)	41,166,794	39,938,898	39,973,933	39,288,557	41,667,000	41,753,323	40,325,260	38,434,049	40,663,224	40,944,800	40,637,744

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