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Segment Information - Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
USD ($)
kt
Sep. 30, 2024
USD ($)
kt
Sep. 30, 2025
USD ($)
kt
Sep. 30, 2024
USD ($)
kt
Mar. 31, 2025
USD ($)
Segment Reporting Information [Line Items]          
Revenue $ 638,906 $ 623,619 $ 1,273,596 $ 1,232,308  
Corporate General and Administrative Expense (21,316) (17,879) (42,099) (33,528)  
Other Non-Operating Income 1,131 724 2,085 3,407  
Interest Expense, net (9,362) (10,714) (21,078) (21,398)  
Earnings before Income Taxes 176,474 185,251 334,332 356,185  
Capital Expenditures 108,538 66,477 184,635 99,605  
Depreciation, Depletion, and Amortization     82,633 77,427  
Segment Assets 3,409,278   3,409,278   $ 3,264,588
External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 638,906 623,619 1,273,596 1,232,308  
Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 33,553 36,068 69,390 74,112  
Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 30,312 28,825 57,595 58,135  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 702,771 688,512 1,400,581 1,364,555  
Freight and Delivery 73,290 77,628 147,629 147,337  
Parts, Supplies, and Services (Includes Maintenance) 64,164 65,639 158,967 157,081  
Energy 54,746 52,582 102,401 99,268  
Raw Materials 119,393 128,758 238,171 249,350  
Labor and Fixed Costs 73,797 68,908 150,311 139,452  
Depreciation, Depletion, and Amortization [1] 40,761 38,310 80,581 75,920  
Purchased Cement 21,831 20,739 39,105 41,558  
Other Segment Items 48,768 22,828 87,992 46,885  
Segment Profit 206,021 213,120 395,424 407,704  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (33,553) (36,068) (69,390) (74,112)  
Consolidation, Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (30,312) (28,825) (57,595) (58,135)  
Cement [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 344,653 313,571 654,979 613,143  
Cement [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 9,904 10,384 19,917 20,664  
Cement [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 30,312 28,825 57,595 58,135  
Cement [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 384,869 $ 352,780 $ 732,491 $ 691,942  
Cement Sales Volume | kt 2,196 2,024 4,189 3,971  
Operating Earnings $ 119,774 $ 115,933 $ 200,858 $ 205,058  
Capital Expenditures 73,037 47,981 119,032 66,775  
Freight and Delivery 32,726 27,821 60,804 54,969  
Parts, Supplies, and Services (Includes Maintenance) 41,928 47,305 116,634 122,211  
Energy 39,310 39,206 72,090 73,103  
Raw Materials 29,205 23,162 50,365 44,160  
Labor and Fixed Costs 42,596 40,329 87,105 81,950  
Depreciation, Depletion, and Amortization [1] 23,224 22,907 46,062 45,824  
Purchased Cement 21,831 20,739 39,105 41,558  
Other Segment Items 34,275 15,378 59,468 23,109  
Segment Profit 119,774 $ 115,933 200,858 $ 205,058  
Segment Assets $ 2,281,191   $ 2,281,191   2,172,459
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 2,021 1,848 3,856 3,615  
Operating Earnings $ 113,465 $ 106,657 $ 190,745 $ 188,066  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 175 176 333 356  
Operating Earnings $ 6,309 $ 9,276 $ 10,113 $ 16,992  
Concrete and Aggregates [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 81,646 65,930 155,362 126,968  
Concrete and Aggregates [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 4,178 4,050 8,030 7,827  
Concrete and Aggregates [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Concrete and Aggregates [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 85,824 69,980 163,392 134,795  
Capital Expenditures 7,025 7,538 12,628 14,127  
Freight and Delivery 7,997 12,945 14,886 18,977  
Parts, Supplies, and Services (Includes Maintenance) 13,632 10,699 25,265 18,794  
Energy 2,624 1,809 4,824 3,736  
Raw Materials 31,074 34,135 60,131 64,036  
Labor and Fixed Costs 11,182 7,565 21,205 15,565  
Depreciation, Depletion, and Amortization [1] 7,137 5,283 13,928 9,813  
Purchased Cement 0 0 0 0  
Other Segment Items 4,254 (1,461) 9,054 1,889  
Segment Profit 7,924 (995) 14,099 1,985  
Segment Assets 415,480   415,480   408,792
Gypsum Wallboard [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 183,482 214,975 404,998 432,801  
Gypsum Wallboard [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Gypsum Wallboard [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Gypsum Wallboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 183,482 214,975 404,998 432,801  
Capital Expenditures 25,519 4,085 47,514 7,365  
Freight and Delivery 32,567 36,862 71,939 73,347  
Parts, Supplies, and Services (Includes Maintenance) 5,257 5,133 10,611 9,063  
Energy 8,516 7,887 17,113 15,484  
Raw Materials 39,750 44,132 86,417 91,203  
Labor and Fixed Costs 15,021 15,631 31,138 31,093  
Depreciation, Depletion, and Amortization [1] 6,494 6,451 13,013 12,924  
Purchased Cement 0 0 0 0  
Other Segment Items 8,570 8,738 14,819 15,570  
Segment Profit 67,307 90,141 159,948 184,117  
Segment Assets 435,457   435,457   429,268
Recycled Paperboard [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 29,125 29,143 58,257 59,396  
Recycled Paperboard [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 19,471 21,634 41,443 45,621  
Recycled Paperboard [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Recycled Paperboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 48,596 50,777 99,700 105,017  
Capital Expenditures 1,622 4,555 2,937 8,116  
Freight and Delivery 0 0 0 44  
Parts, Supplies, and Services (Includes Maintenance) 3,347 2,502 6,457 7,013  
Energy 4,296 3,680 8,374 6,945  
Raw Materials 19,364 27,329 41,258 49,951  
Labor and Fixed Costs 4,998 5,383 10,863 10,844  
Depreciation, Depletion, and Amortization [1] 3,906 3,669 7,578 7,359  
Purchased Cement 0 0 0 0  
Other Segment Items 1,669 173 4,651 6,317  
Segment Profit 11,016 8,041 20,519 16,544  
Segment Assets 163,829   163,829   166,673
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Capital Expenditures 1,335 $ 2,318 2,524 $ 3,222  
Segment Assets $ 113,321   $ 113,321   $ 87,396
[1]

(1) Depreciation, Depletion, and Amortization for corporate assets was $1,228 and $2,052 for the three and six months ended September 30, 2025, respectively, and $767 and $1,507 for the three and six months ended September 30, 2024, respectively.