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