Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Inventory Disclosure [Abstract]
Materials, purchased parts and supplies	$ 37,421	$ 37,368
Work in process	10,062	6,021
Finished goods	10,373	3,834
Total	$ 57,856	$ 47,223