Leases - Other Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020
Leases [Abstract]
Operating Leases, Operating cash flows	$ 16,506	$ 11,531
Operating Leases, ROU assets obtained in exchange for lease liabilities	$ 20,421	$ 4,954
Operating Leases, Weighted-average remaining lease term (in years)	5 years 9 months 29 days	5 years 2 months 26 days
Operating Leases, Weighted-average discount rate	2.61%	2.89%
Financing Leases, Operating cash flows	$ 145	$ 61
Financing Leases, Financing cash flows	$ 392	361
Financing Leases, ROU assets obtained in exchange for lease liabilities		$ 15,217
Financing Leases, Weighted-average remaining lease term (in years)	33 years 10 days	31 years 4 months 17 days
Financing Leases, Weighted-average discount rate	3.71%	3.68%