Supplementary Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Unaudited consolidated quarterly statements of operations data
Net revenues	$ 115,608	$ 107,317	$ 98,014	$ 87,649	$ 85,430	$ 65,898	$ 60,417	$ 58,409	$ 408,588	$ 270,154	$ 234,847
Gross margin	53,927	50,783	47,389	39,444	38,176	31,402	29,739	28,302	191,543	127,619	114,200
Income from operations	13,008	11,695	8,958	3,742	7,654	6,819	6,369	3,131	37,403	23,973	18,355
Income from continuing operations before income taxes	11,307	10,218	6,983	2,560	8,590	6,999	6,473	3,224	31,068	25,286	18,795
Income tax (benefit) provision	2,503	3,170	1,779	(1,259)	1,101	2,642	1,433	368	6,193	5,544	4,366
Income from continuing operations	8,804	7,048	5,204	3,819	7,489	4,357	5,040	2,856	24,875	19,742	14,429
Net income	$ 8,804	$ 7,048	$ 5,204	$ 3,819	$ 7,489	$ 4,357	$ 5,040	$ 2,856	$ 24,875	$ 19,742	$ 10,369
Earnings Per Share [Abstract]
Basic net income per share (in dollars per share)	$ 0.19	$ 0.16	$ 0.13	$ 0.10	$ 0.20	$ 0.13	$ 0.15	$ 0.09	$ 0.59	$ 0.58	$ 0.32
Diluted net income per share (in dollars per share)	$ 0.19	$ 0.16	$ 0.13	$ 0.10	$ 0.19	$ 0.13	$ 0.15	$ 0.08	$ 0.58	$ 0.56	$ 0.31
Cost of revenues									$ 217,045	$ 142,535	$ 120,647
Excess tax benefit from share-based compensation recognized as a benefit to income taxes					$ 126	$ (169)	$ 247	$ 896		1,100
As Adjusted
Earnings Per Share [Abstract]
Cost of revenues						$ (1)	$ (1)	$ (1)		$ (2,845)	$ (3,981)