Leases - Composition of net lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Leases
Operating lease expense	$ 1,919	$ 1,885	$ 5,901	$ 5,647
Variable lease expense	317	361	928	992
Short-term lease expense	219	196	622	613
Total lease expense	$ 2,455	$ 2,442	$ 7,451	$ 7,252