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Segment Information - Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2024
USD ($)
kt
Dec. 31, 2023
USD ($)
kt
Dec. 31, 2024
USD ($)
kt
Dec. 31, 2023
USD ($)
kt
Mar. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Revenue $ 558,025 $ 558,833 $ 1,790,333 $ 1,782,590  
Operating Earnings 182,800 189,913 590,504 588,431  
Corporate General and Administrative Expense (20,818) (14,201) (54,346) (42,456)  
Other Non-Operating Income (Loss) 1,381 1,019 4,788 2,837  
Earnings Before Interest and Income Taxes 163,363 176,731 540,946 548,812  
Interest Expense, net (9,061) (10,128) (30,459) (32,571)  
Earnings Before Income Taxes 154,302 166,603 510,487 516,241  
Capital Expenditures 47,370 22,435 146,975 87,848  
Depreciation, Depletion and Amortization     116,661 111,347  
Identifiable Assets 3,043,670   3,043,670   $ 2,947,019
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 621,767 617,862 1,986,322 1,964,659  
Depreciation, Depletion and Amortization 39,234 37,468 116,661 111,347  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (37,316) (32,346) (111,428) (99,356)  
Revenue 37,316 32,346 111,428 99,356  
Consolidation, Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue (26,426) (26,683) (84,561) (82,713)  
Cement [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 295,400 $ 308,654 $ 987,342 $ 998,437  
Cement Sales Volume | kt 1,702 1,824 5,673 5,966  
Operating Earnings $ 86,763 $ 105,566 $ 291,821 $ 301,056  
Capital Expenditures 35,609 11,571 102,384 38,288  
Depreciation, Depletion and Amortization 23,029 $ 22,514 68,853 $ 66,380  
Identifiable Assets $ 2,115,736   $ 2,115,736   2,042,499
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 1,541 1,663 5,156 5,470  
Operating Earnings $ 81,776 $ 96,281 $ 269,842 $ 278,266  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]          
Segment Reporting Information [Line Items]          
Cement Sales Volume | kt 161 161 517 496  
Operating Earnings $ 4,987 $ 9,285 $ 21,979 $ 22,790  
Cement [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue 9,084 7,804 29,748 27,192  
Concrete and Aggregates [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 60,716 61,186 195,511 201,526  
Operating Earnings (1,397) 1,760 588 13,434  
Capital Expenditures 4,668 1,207 18,795 10,281  
Depreciation, Depletion and Amortization 5,261 4,857 15,074 14,850  
Identifiable Assets 259,266   259,266   225,485
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue 4,311 3,414 12,138 10,235  
Gypsum Wallboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 209,493 200,969 642,294 629,299  
Operating Earnings 86,393 75,063 270,510 251,625  
Capital Expenditures 2,560 7,386 9,925 23,866  
Depreciation, Depletion and Amortization 6,414 5,611 19,338 16,620  
Identifiable Assets 409,056   409,056   432,122
Recycled Paperboard [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue 56,158 47,053 161,175 135,397  
Operating Earnings 11,041 7,524 27,585 22,316  
Capital Expenditures 4,309 1,868 12,425 7,733  
Depreciation, Depletion and Amortization 3,723 3,694 11,082 11,121  
Identifiable Assets 168,690   168,690   170,832
Recycled Paperboard [Member] | Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue 23,921 21,128 69,542 61,929  
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Capital Expenditures 224 403 3,446 7,680  
Depreciation, Depletion and Amortization 807 $ 792 2,314 $ 2,376  
Other, net [Member]          
Segment Reporting Information [Line Items]          
Identifiable Assets $ 90,922   $ 90,922   $ 76,081