Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019	May 31, 2018
Income Taxes [Line Items]
Provisional income tax benefit related to re-measurement of deferred tax assets and liabilities				$ 38,200
Provisional income tax expense related to repatriation tax				$ 6,900
Effective tax rates upon inclusion of net earnings attributable to noncontrolling interests	19.20%	23.80%	20.90%
Minimum likelihood of tax benefits being recognized upon ultimate settlement	50.00%
Total unrecognized tax benefits	$ 3,836	$ 1,718	$ 1,621
Unrecognized tax benefits if recognized would affect tax rate attributable to controlling interest	3,030
Interest and penalties related to unrecognized tax benefits	12	68	$ 287
Valuation allowance for deferred tax assets	9,124	$ 11,178
Federal Jurisdiction
Income Taxes [Line Items]
Net operating loss carry forwards	1,640
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carry forwards	$ 8,125
State and Local Jurisdiction | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	May 31, 2041
State and Local Jurisdiction | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	Jun. 01, 2022
Settlement with Taxing Authority
Income Taxes [Line Items]
Liability for unrecognized tax benefit expected to be settled in the next 12 months	$ 53