Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Pension Plans | Foreign Plan
Components of net periodic benefit (credit) cost:
Interest cost	$ 300	$ 200	$ 700	$ 500
Expected return on assets	(300)	(300)	(600)	(600)
Net amortization of prior service credit	0	0	0	0
Amortization of (gain) loss	300	100	600	200
Net periodic benefit (credit) cost	300	0	700	100
Post-Retirement Benefits
Components of net periodic benefit (credit) cost:
Interest cost	100	100	200	200
Expected return on assets	0	0	0	0
Net amortization of prior service credit	(200)	(200)	(400)	(400)
Amortization of (gain) loss	0	0	0	0
Net periodic benefit (credit) cost	$ (100)	$ (100)	$ (200)	$ (200)