v3.25.4
Segment Information - Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2025
USD ($)
kt
Dec. 31, 2024
USD ($)
kt
Dec. 31, 2025
USD ($)
kt
Dec. 31, 2024
USD ($)
kt
Mar. 31, 2025
USD ($)
Segment Reporting Information [Line Items]          
Revenue $ 555,956 $ 558,025 $ 1,829,552 $ 1,790,333  
Corporate General and Administrative Expense (24,010) (20,818) (66,109) (54,346)  
Other Non-Operating Income 1,644 1,381 3,729 4,788  
Interest Expense, net (13,712) (9,061) (34,790) (30,459)  
Earnings before Income Taxes 129,248 154,302 463,580 510,487  
Capital Expenditures 110,045 47,370 294,680 146,975  
Depreciation, Depletion, and Amortization     124,243 116,661  
Segment Assets 3,843,435   3,843,435   $ 3,264,588
External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 555,956 558,025 1,829,552 1,790,333  
Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 33,060 37,316 102,450 111,428  
Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 29,366 26,426 86,961 84,561  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 618,382 621,767 2,018,963 1,986,322  
Freight and Delivery 64,378 64,877 212,007 212,213  
Parts, Supplies, and Services (Includes Maintenance) 71,274 66,090 230,164 222,681  
Energy 50,872 50,234 153,244 149,771  
Raw Materials 115,629 118,806 353,802 367,138  
Labor and Fixed Costs 75,702 70,263 225,833 210,834  
Depreciation, Depletion, and Amortization [1] 40,126 38,427 120,707 114,347  
Purchased Cement 21,773 16,404 60,878 57,962  
Other Segment Items 13,302 13,866 101,578 60,872  
Segment Profit 165,326 182,800 560,750 590,504  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (33,060) (37,316) (102,450) (111,428)  
Consolidation, Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (29,366) (26,426) (86,961) (84,561)  
Cement [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 283,496 259,890 938,475 873,033  
Cement [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 8,309 9,084 28,226 29,748  
Cement [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Revenue 29,366 26,426 86,961 84,561  
Cement [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 321,171 $ 295,400 $ 1,053,662 $ 987,342  
Cement Sales Volume | kt 1,861 1,702 6,050 5,673  
Operating Earnings $ 91,343 $ 86,763 $ 292,201 $ 291,821  
Capital Expenditures 68,271 35,609 187,303 102,384  
Freight and Delivery 24,868 21,490 85,672 76,459  
Parts, Supplies, and Services (Includes Maintenance) 48,696 48,748 165,330 170,959  
Energy 35,960 36,068 108,050 109,171  
Raw Materials 26,176 22,103 76,541 66,263  
Labor and Fixed Costs 43,496 40,869 130,603 122,819  
Depreciation, Depletion, and Amortization [1] 24,169 23,029 70,231 68,853  
Purchased Cement 21,773 16,404 60,878 57,962  
Other Segment Items 4,690 (74) 64,156 23,035  
Segment Profit 91,343 $ 86,763 292,201 $ 291,821  
Segment Assets $ 2,295,110   $ 2,295,110   2,172,459
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 1,687 1,541 5,543 5,156  
Operating Earnings $ 86,923 $ 81,776 $ 277,668 $ 269,842  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 174 161 507 517  
Operating Earnings $ 4,420 $ 4,987 $ 14,533 $ 21,979  
Concrete and Aggregates [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 68,999 56,405 224,361 183,373  
Concrete and Aggregates [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 4,500 4,311 12,530 12,138  
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 73,499 60,716 236,891 195,511  
Capital Expenditures 6,392 4,668 19,020 18,795  
Freight and Delivery 7,116 7,881 22,003 26,857  
Parts, Supplies, and Services (Includes Maintenance) 13,681 9,636 38,869 27,940  
Energy 2,219 1,836 7,015 5,841  
Raw Materials 26,127 26,886 86,261 89,904  
Labor and Fixed Costs 10,155 8,456 31,178 25,140  
Depreciation, Depletion, and Amortization [1] 6,999 5,261 20,927 15,074  
Purchased Cement 0 0 0 0  
Other Segment Items 5,822 2,157 15,159 4,167  
Segment Profit 1,380 (1,397) 15,479 588  
Segment Assets 404,583   404,583   408,792
Gypsum Wallboard [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 175,874 209,493 580,872 642,294  
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 175,874 209,493 580,872 642,294  
Capital Expenditures 29,450 2,560 76,964 9,925  
Freight and Delivery 32,394 35,506 104,332 108,853  
Parts, Supplies, and Services (Includes Maintenance) 4,998 4,804 15,609 13,867  
Energy 8,427 8,807 25,539 24,291  
Raw Materials 44,035 45,788 130,451 136,991  
Labor and Fixed Costs 16,584 15,505 47,723 46,598  
Depreciation, Depletion, and Amortization [1] 5,663 6,414 18,676 19,338  
Purchased Cement 0 0 0 0  
Other Segment Items 2,416 6,276 17,237 21,846  
Segment Profit 61,357 86,393 221,305 270,510  
Segment Assets 473,720   473,720   429,268
Recycled Paperboard [Member] | External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 27,587 32,237 85,844 91,633  
Recycled Paperboard [Member] | Intersegment [Member]          
Segment Reporting Information [Line Items]          
Revenue 20,251 23,921 61,694 69,542  
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 47,838 56,158 147,538 161,175  
Capital Expenditures 5,174 4,309 8,111 12,425  
Freight and Delivery 0 0 0 44  
Parts, Supplies, and Services (Includes Maintenance) 3,899 2,902 10,356 9,915  
Energy 4,266 3,523 12,640 10,468  
Raw Materials 19,291 24,029 60,549 73,980  
Labor and Fixed Costs 5,467 5,433 16,329 16,277  
Depreciation, Depletion, and Amortization [1] 3,295 3,723 10,873 11,082  
Purchased Cement 0 0 0 0  
Other Segment Items 374 5,507 5,026 11,824  
Segment Profit 11,246 11,041 31,765 27,585  
Segment Assets 165,992   165,992   166,673
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Capital Expenditures 758 $ 224 3,282 $ 3,446  
Segment Assets $ 504,030   $ 504,030   $ 87,396
[1]

(1) Depreciation, Depletion, and Amortization for corporate assets was $1,484 and $3,536 for the three and nine months ended December 31, 2025, respectively, and $807 and $2,314 for the three and nine months ended December 31, 2024, respectively.