v3.26.1
Segment Information - Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended
Jun. 30, 2026
USD ($)
kt
Jun. 30, 2025
USD ($)
kt
Mar. 31, 2026
USD ($)
Segment Reporting Information [Line Items]      
Revenue $ 650,966 $ 634,690  
Corporate General and Administrative Expense (20,202) (20,783)  
Other Non-Operating Income 746 954  
Interest Expense, net (12,947) (11,716)  
Earnings Before Income Taxes 131,685 157,858  
Capital Expenditures 120,755 76,097  
Depreciation, Depletion, and Amortization 41,199 40,644  
Segment Assets 3,908,165   $ 3,842,244
External Customers [Member]      
Segment Reporting Information [Line Items]      
Revenue 650,966 634,690  
Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenue 36,429 35,837  
Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenue 31,410 27,283  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 718,805 697,810  
Freight and Delivery 86,483 74,339  
Parts, Supplies, and Services (Includes Maintenance) 103,296 94,803  
Energy 47,574 47,655  
Raw Materials 126,005 118,778  
Labor and Fixed Costs 78,684 76,514  
Depreciation, Depletion, and Amortization [1] 39,689 39,820  
Purchased Cement 17,843 17,274  
Other Segment Items 55,143 39,224  
Segment Profit 164,088 189,403  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue (36,429) (35,837)  
Consolidation, Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue (31,410) (27,283)  
Cement [Member] | External Customers [Member]      
Segment Reporting Information [Line Items]      
Revenue 336,493 310,326  
Cement [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenue 9,996 10,013  
Cement [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenue 31,410 27,283  
Cement [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 377,899 $ 347,622  
Cement Sales Volume | kt 2,145 1,993  
Operating Earnings $ 73,605 $ 81,084  
Capital Expenditures 66,863 45,995  
Freight and Delivery 35,338 28,078  
Parts, Supplies, and Services (Includes Maintenance) 82,079 74,706  
Energy 32,574 32,780  
Raw Materials 25,399 21,160  
Labor and Fixed Costs 47,495 44,509  
Depreciation, Depletion, and Amortization [1] 24,263 22,838  
Purchased Cement 17,843 17,274  
Other Segment Items 39,303 25,193  
Segment Profit 73,605 $ 81,084  
Segment Assets $ 2,440,966   2,361,230
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kt 1,960 1,835  
Operating Earnings $ 70,762 $ 77,280  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kt 185 158  
Operating Earnings $ 2,843 $ 3,804  
Concrete and Aggregates [Member] | External Customers [Member]      
Segment Reporting Information [Line Items]      
Revenue 76,232 73,716  
Concrete and Aggregates [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenue 4,516 3,852  
Concrete and Aggregates [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Concrete and Aggregates [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 80,748 77,568  
Capital Expenditures 5,954 5,603  
Freight and Delivery 8,322 6,889  
Parts, Supplies, and Services (Includes Maintenance) 13,014 11,633  
Energy 3,126 2,200  
Raw Materials 29,135 29,057  
Labor and Fixed Costs 9,720 10,023  
Depreciation, Depletion, and Amortization [1] 7,748 6,791  
Purchased Cement 0 0  
Other Segment Items 5,680 4,800  
Segment Profit 4,003 6,175  
Segment Assets 417,792   404,766
Gypsum Wallboard [Member] | External Customers [Member]      
Segment Reporting Information [Line Items]      
Revenue 204,747 221,516  
Gypsum Wallboard [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Gypsum Wallboard [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Gypsum Wallboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 204,747 221,516  
Capital Expenditures 42,373 21,995  
Freight and Delivery 42,823 39,372  
Parts, Supplies, and Services (Includes Maintenance) 4,957 5,354  
Energy 7,960 8,597  
Raw Materials 49,485 46,667  
Labor and Fixed Costs 15,664 16,117  
Depreciation, Depletion, and Amortization [1] 5,305 6,519  
Purchased Cement 0 0  
Other Segment Items 5,200 6,249  
Segment Profit 73,353 92,641  
Segment Assets 558,126   522,861
Recycled Paperboard [Member] | External Customers [Member]      
Segment Reporting Information [Line Items]      
Revenue 33,494 29,132  
Recycled Paperboard [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenue 21,917 21,972  
Recycled Paperboard [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Recycled Paperboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 55,411 51,104  
Capital Expenditures 4,096 1,315  
Freight and Delivery 0 0  
Parts, Supplies, and Services (Includes Maintenance) 3,246 3,110  
Energy 3,914 4,078  
Raw Materials 21,986 21,894  
Labor and Fixed Costs 5,805 5,865  
Depreciation, Depletion, and Amortization [1] 2,373 3,672  
Purchased Cement 0 0  
Other Segment Items 4,960 2,982  
Segment Profit 13,127 9,503  
Segment Assets 167,818   169,630
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Capital Expenditures 1,469 $ 1,189  
Segment Assets $ 323,463   $ 383,757
[1] Depreciation, Depletion, and Amortization for corporate assets was $1,510 and $824 for the three months ended June 30, 2026, and 2025, respectively.