Operations by Segments and Geographic Areas - Schedule of Revenue Based on Point of Sale (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues from unaffiliated customers	$ 110,639	$ 111,715	$ 111,691	$ 108,176	$ 108,241	$ 106,438	$ 104,846	$ 102,437	$ 442,221	$ 421,962	$ 394,096
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues from unaffiliated customers									277,153	261,779	242,170
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues from unaffiliated customers									106,492	99,746	91,489
Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues from unaffiliated customers									39,071	38,698	39,759
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues from unaffiliated customers									$ 19,505	$ 21,739	$ 20,678