Income Taxes - Additional Information (Detail) - USD ($)	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2017	May 31, 2020	May 31, 2019	May 31, 2018
Income Taxes [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%	21.00%	29.20%
Provisional income tax benefit related to re-measurement of deferred tax assets and liabilities					$ 38,200,000
Provisional income tax expense related to repatriation tax					6,900,000
Tax benefits (expense) related to defined benefit pension liability credited to other comprehensive income			$ 1,365,000	$ 418,000	(309,000)
Tax benefits (expenses) related to cash flow hedges credited to (deducted from) other comprehensive income			$ (559,000)	$ 3,780,000	$ (392,000)
Effective tax rates upon inclusion of net earnings attributable to noncontrolling interests			23.80%	20.90%	3.90%
Minimum likelihood of tax benefits being recognized upon ultimate settlement			50.00%
Total unrecognized tax benefits	$ 2,638,000		$ 1,718,000	$ 1,621,000	$ 2,638,000
Unrecognized tax benefits if recognized would affect tax rate attributable to controlling interest			1,357,000
Interest and penalties related to unrecognized tax benefits	$ 271,000		68,000	287,000	$ 271,000
Valuation allowance for deferred tax assets			11,178,000	$ 14,619,000
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carry forwards			$ 10,494,000
State and Local Jurisdiction | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforwards, expiration date			May 31, 2040
Non - United States | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforwards, expiration date			May 31, 2020
Settlement with Taxing Authority
Income Taxes [Line Items]
Liability for unrecognized tax benefit expected to be settled in the next 12 months			$ 167,000