Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues to unaffiliated customers									$ 493,184	$ 408,588	$ 270,154
Inter-geographic revenues									0	0	0
Net revenues	$ 152,867	$ 116,336	$ 117,912	$ 106,069	$ 115,608	$ 107,317	$ 98,014	$ 87,649	493,184	408,588	270,154
Identifiable long-lived assets	50,980				51,643				50,980	51,643	28,337
US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues									410,050	341,699	220,253
Reportable Geographical Components | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues to unaffiliated customers									450,218	380,538	259,781
Inter-geographic revenues									10,650	7,637	7,911
Net revenues									460,868	388,175	267,692
Identifiable long-lived assets	47,997				50,340				47,997	50,340	28,187
Reportable Geographical Components | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues to unaffiliated customers									35,000	22,242	5,464
Inter-geographic revenues									925	44	447
Net revenues									35,925	22,286	5,911
Identifiable long-lived assets	2,974				1,288				2,974	1,288	127
Reportable Geographical Components | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues to unaffiliated customers									7,966	5,808	4,909
Inter-geographic revenues									0	0	0
Net revenues									7,966	5,808	4,909
Identifiable long-lived assets	9				15				9	15	23
Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues to unaffiliated customers									0	0	0
Inter-geographic revenues									(11,575)	(7,681)	(8,358)
Net revenues									(11,575)	(7,681)	(8,358)
Identifiable long-lived assets	$ 0				$ 0				$ 0	$ 0	$ 0