v3.26.1
Comprehensive Income (Loss) - Components of Changes in AOCI (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance $ 938,237 $ 891,012 $ 1,821,628
Income tax effect 778 1,084 (4,376)
Separation of Worthington Steel     (1,033,245)
Balance 1,027,040 938,237 891,012
Foreign Currency Translation      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance 2,581 (669)  
OCI before reclassifications 6,548 2,297  
Income tax effect 646 953  
Balance 9,775 2,581 (669)
Pension Liability Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (365) (441)  
OCI before reclassifications 120 (83)  
Income tax effect (25) 159  
Balance (270) (365) (441)
Cash Flow Hedges      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance 1,834 1,564  
OCI before reclassifications 1,569 689  
Reclassification adjustments to income [1] (2,159) (391)  
Income tax effect 157 (28)  
Balance 1,401 1,834 1,564
AOCI      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance 4,050 454 (23,179)
OCI before reclassifications 8,237 2,903  
Reclassification adjustments to income [1] (2,159) (391)  
Income tax effect 778 1,084  
Separation of Worthington Steel     (717)
Balance $ 10,906 $ 4,050 $ 454
[1] Cash flow hedges – disclosed in “Note Q – Derivative Instruments and Hedging Activities.”