Postretirement and Other Employee Benefits - Components of Net Periodic Pension Costs for the Swiss Pension Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Components of net periodic cost
Service cost	$ 2,955	$ 2,532
Interest cost	226	456
Swiss Pension Fund Foundation
Components of net periodic cost
Service cost	2,955	2,532	$ 2,539
Interest cost	226	456	353
Net prior service credit	(311)	(306)	(91)
Net actuarial loss	482	219	217
Expected return on plan assets	(1,252)	(1,384)	(1,196)
Settlements	1,049	617	0
Net periodic cost	$ 3,149	$ 2,134	$ 1,822