Employee Benefit Plans - Components of Net Periodic Pension (Benefit) Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021
Retirement Benefits [Abstract]
Interest cost	$ 2,148	$ 2,050
Expected return on assets	(3,651)	(2,924)
Amortization of net loss	0	222
Net periodic pension benefit	$ (1,503)	$ (652)