Postretirement and Other Employee Benefits - Components of Net Periodic Pension Costs for the Swiss Pension Plan (Detail) - Foreign Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Components of net periodic cost
Service cost	$ 630	$ 624	$ 1,275	$ 1,264
Interest cost	114	87	230	176
Prior service credit	(77)	(22)	(155)	(45)
Net actuarial loss	54	54	110	109
Expected return on plan assets	(345)	(294)	(698)	(595)
Net periodic cost	$ 376	$ 449	$ 762	$ 909