Leases - Other Information Related to Operating Leases (Detail) $ in Thousands	6 Months Ended
	Nov. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows	$ 5,702
ROU assets obtained in exchange for lease liabilities	$ 3,722
Weighted-average remaining lease term (in years)	5 years 5 months 12 days
Weighted-average discount rate	3.44%
Operating cash flows	$ 19
Financing cash flows	173
ROU assets obtained in exchange for lease liabilities	$ 8,028
Weighted-average remaining lease term (in years)	3 years 1 month 13 days
Weighted-average discount rate	3.23%