Leases - Supplemental statement of operations information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating lease expense	$ 4,382	$ 4,164	$ 4,697
Amortization of ROU assets	134	166	266
Interest expense on finance lease liabilities	15	27	21
Short-term lease expense	250	248	240
Net lease expense	$ 4,781	$ 4,605	$ 5,224