Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020
Leases [Abstract]
Operating lease expense	$ 10,123	$ 12,454
Amortization of leased assets	648	451
Interest on lease liabilities	145	61
Total financing lease expense	793	512
Short-term lease expense	578	599
Variable lease expense	2,398	2,580
Total lease expense	$ 13,892	$ 16,145