Employee Pension Plans - Components of Net Periodic Pension Costs for Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2023	May 31, 2022	May 31, 2021
Retirement Benefits [Abstract]
Interest cost		$ 4,393	$ 2,621	$ 1,205
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Return on plan assets		$ (5,092)	$ (4,473)	$ (4,289)
Net amortization and deferral costs		$ 191	$ 546	$ 3,058
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Settlement cost	[1]	$ 4,774	$ 1,357	$ 18
Defined contribution plans		19,600	18,036	17,562
Net periodic benefit cost		$ 23,866	$ 18,087	$ 17,554

[1] Relates to the settlement of certain participant balances within the Gerstenslager Plan.   During fiscal 2023 and fiscal 2022, we also incurred $135 and $85, respectively, in net periodic benefit cost related to the Tempel Steel Company Postretirement Benefit Plan.