Employee Pension Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020	Dec. 01, 2021
Defined Benefit Plan Disclosure [Line Items]
Description of investment policy and strategy for the defined benefit plan	The investment policy and strategy for the defined benefit plans is: (i) long-term in nature with liquidity requirements that are anticipated to be minimal due to the projected normal retirement date of the average employee and the current average age of participants; (ii) to earn nominal returns, net of investment fees, equal to or in excess of the defined benefit plans' respective liability growth rate; and (iii) to include a diversified asset allocation of domestic and international equities and fixed income investments.
Expected employer contribution to defined benefit plan during fiscal 2023	$ 7,836,000
Discount rate	2.74%	2.65%	3.57%
Tempel Steel Company
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit obligations, net				$ 40,160,000
Australian Sustainable Energy Solutions
Defined Benefit Plan Disclosure [Line Items]
Accrued liability of unfunded plans included in other liabilities	$ 6,249,000	$ 7,062,000
Net periodic pension costs	$ 51,000	$ 625,000	$ 494,000
Assumed salary rate increase	2.75%
Discount rate	1.90%	1.10%	1.65%