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Segment Operations - Financial Information for Reportable Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
May 31, 2025
Segment Reporting Information [Line Items]      
Net sales $ 303,707 $ 257,308  
Cost of goods sold 221,423 194,813  
SG&A 70,565 66,036  
Restructuring and other expense, net 2,476 1,158  
Other segment items [1] 219 3  
Equity in net income of unconsolidated affiliates 36,657 35,492  
Earnings (loss) before income taxes 45,681 30,790  
Reconciling items to adjusted EBITDA      
Depreciation and amortization 13,086 11,830  
Interest expense (income) 63 489  
Stock-based compensation 3,427 3,925  
Net loss attributable to noncontrolling interest 327 245  
Adjusted EBITDA 65,060 48,437  
Total assets 1,738,137   $ 1,695,152
Total Reportable Operating Segments      
Segment Reporting Information [Line Items]      
Net sales 303,707 257,308  
Cost of goods sold 221,371 194,760  
SG&A 61,346 54,911  
Restructuring and other expense, net 309 289  
Other segment items [1] 116 (240)  
Equity in net income of unconsolidated affiliates 38,320 36,645  
Earnings (loss) before income taxes 58,885 44,233  
Reconciling items to adjusted EBITDA      
Depreciation and amortization 12,894 11,630  
Interest expense (income) (20) 17  
Stock-based compensation 1,546 1,090  
Net loss attributable to noncontrolling interest 327 245  
Adjusted EBITDA 73,941 57,504  
Total assets 1,462,328   1,327,024
Total Reportable Operating Segments | Consumer Products      
Segment Reporting Information [Line Items]      
Net sales 118,938 117,596  
Cost of goods sold 79,972 78,113  
SG&A 27,710 26,861  
Restructuring and other expense, net 13    
Other segment items [1] 18 (15)  
Earnings (loss) before income taxes 11,225 12,637  
Reconciling items to adjusted EBITDA      
Depreciation and amortization 3,858 4,336  
Interest expense (income) (2)    
Stock-based compensation 727 557  
Net loss attributable to noncontrolling interest 327 245  
Adjusted EBITDA 16,148 17,775  
Total assets 534,316   531,187
Total Reportable Operating Segments | Building Products      
Segment Reporting Information [Line Items]      
Net sales 184,769 139,712  
Cost of goods sold 141,399 11,664  
SG&A 33,636 28,050  
Restructuring and other expense, net 296 289  
Other segment items [1] 98 (225)  
Equity in net income of unconsolidated affiliates 38,320 36,645  
Earnings (loss) before income taxes 47,660 31,596  
Reconciling items to adjusted EBITDA      
Depreciation and amortization 9,036 7,294  
Interest expense (income) (18) 17  
Stock-based compensation 819 533  
Adjusted EBITDA 57,793 39,729  
Total assets 928,012   795,837
Other      
Segment Reporting Information [Line Items]      
Equity in net income of unconsolidated affiliates (1,663) (1,153)  
Earnings (loss) before income taxes (1,663) (1,153)  
Reconciling items to adjusted EBITDA      
Adjusted EBITDA (1,663) (1,153)  
Unallocated Corp      
Segment Reporting Information [Line Items]      
Cost of goods sold 52 53  
SG&A 9,219 11,125  
Restructuring and other expense, net 2,167 869  
Other segment items [1] 103 243  
Earnings (loss) before income taxes (11,541) (12,290)  
Reconciling items to adjusted EBITDA      
Depreciation and amortization 192 200  
Interest expense (income) 83 472  
Stock-based compensation 1,881 2,835  
Adjusted EBITDA (7,218) $ (7,914)  
Total assets $ 275,809   $ 368,128
[1] Other segment items consist of non-operating activity included in adjusted EBITDA, which is our segment profit measure.