Operations by Segments and Geographic Areas - Schedule of Long-Lived Assets, Based on Geographical Location, Excluding Deferred Tax Assets and Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Long-lived assets
Long-lived assets	$ 47,228	$ 43,866
North America [Member]
Long-lived assets
Long-lived assets	37,872	35,569
United Kingdom [Member]
Long-lived assets
Long-lived assets	5,738	5,188
Continental Europe [Member]
Long-lived assets
Long-lived assets	1,297	1,208
Asia-Pacific and Middle East [Member]
Long-lived assets
Long-lived assets	$ 2,321	$ 1,901