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v3.25.1

Business Segments - Financial Information Related to Operations by Segment (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 USD ($) kt | Mar. 31, 2024 USD ($) kt | Mar. 31, 2023 USD ($) kt
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 2,260,508 | $ 2,259,297 | $ 2,148,069
Corporate General and Administrative Expense |  | (73,942) | (59,795) | (53,630)
Other Nonoperating Income (Loss) |  | 6,420 | 3,087 | 2,654
Interest Expense, net |  | (40,526) | (42,257) | (35,171)
Earnings Before Income Taxes |  | 591,485 | 617,937 | 588,593
Capital Expenditures |  | 195,281 | 120,305 | 110,143
Freight and Delivery |  | 269,685 |  |
Depreciation, Depletion and Amortization |  | 158,902 | 149,832 | 138,554
Segment Assets |  | 3,264,588 | 2,947,019 | 2,781,002
External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 2,260,508 | 2,259,297 | 2,148,069
Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 139,770 | 130,654 | 125,750
Joint Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 110,943 | 112,736 | 113,518
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 2,511,221 | 2,502,687 | 2,387,337
Freight and Delivery |  |  | 278,071 | 302,537
Parts, Supplies, and Services (Includes Maintenance) |  | 302,269 | 282,162 | 229,972
Energy |  | 196,329 | 217,670 | 224,772
Raw Materials |  | 468,167 | 461,725 | 467,623
Labor and Fixed Costs |  | 282,862 | 268,803 | 236,032
Depreciation, Depletion and Amortization | [1] | 155,653 | 146,715 | 135,742
Purchased Cement |  | 77,059 | 86,219 | 47,454
Other Segment Items |  | 59,664 | 44,420 | 68,465
Segment Profit |  | 699,533 | 716,902 | 674,740
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | (139,770) | (130,654) | (125,750)
Consolidation, Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | (110,943) | (112,736) | (113,518)
Cement [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Freight and Delivery |  | 90,996 |  |
Cement [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 1,053,620 | 1,077,918 | 927,637
Cement [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 36,799 | 35,363 | 32,915
Cement [Member] | Joint Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 110,943 | 112,736 | 113,518
Cement [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 1,201,362 | $ 1,226,017 | $ 1,074,070
Cement Sales Volume | kt |  | 6,912 | 7,289 | 7,133
Operating Earnings |  | $ 319,456 | $ 338,349 | $ 278,762
Capital Expenditures |  | 139,965 | 65,442 | 39,049
Freight and Delivery |  |  | 94,031 | 97,126
Parts, Supplies, and Services (Includes Maintenance) |  | 231,530 | 217,393 | 183,706
Energy |  | 140,754 | 154,925 | 149,445
Raw Materials |  | 84,669 | 87,154 | 75,617
Labor and Fixed Costs |  | 162,741 | 155,118 | 141,719
Depreciation, Depletion and Amortization | [1] | 91,817 | 89,138 | 81,643
Purchased Cement |  | 77,059 | 86,219 | 47,454
Other Segment Items |  | 2,340 | 3,690 | 18,598
Segment Profit |  | 319,456 | 338,349 | 278,762
Segment Assets |  | $ 2,172,459 | $ 2,042,499 | $ 1,905,227
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cement Sales Volume | kt |  | 6,237 | 6,610 | 6,399
Operating Earnings |  | $ 293,060 | $ 306,768 | $ 243,288
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cement Sales Volume | kt |  | 675 | 679 | 734
Operating Earnings |  | $ 26,396 | $ 31,581 | $ 35,474
Concrete and Aggregates [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Freight and Delivery |  | 32,593 |  |
Concrete and Aggregates [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 237,723 | 240,012 | 239,516
Concrete and Aggregates [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 13,913 | 12,940 | 0
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 |  | 251,636 | 252,952 | 239,516
Capital Expenditures |  | 20,571 | 15,103 | 35,503
Freight and Delivery |  |  | 33,976 | 36,115
Parts, Supplies, and Services (Includes Maintenance) |  | 39,109 | 31,246 | 17,724
Energy |  | 7,562 | 7,641 | 5,236
Raw Materials |  | 109,587 | 112,447 | 112,269
Labor and Fixed Costs |  | 36,722 | 31,014 | 19,511
Depreciation, Depletion and Amortization | [1] | 23,247 | 19,728 | 17,413
Purchased Cement |  |  |  | 0
Other Segment Items |  | 11,581 | 4,499 | 12,989
Segment Profit |  | (8,765) | 12,401 | 18,259
Segment Assets |  | 408,792 | 225,485 | 234,767
Gypsum Wallboard [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Freight and Delivery |  | 146,000 |  |
Gypsum Wallboard [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 846,499 | 839,530 | 872,471
Gypsum Wallboard [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 0 | 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 |  | 846,499 | 839,530 | 872,471
Capital Expenditures |  | 15,843 | 29,127 | 31,063
Freight and Delivery |  |  | 149,441 | 160,536
Parts, Supplies, and Services (Includes Maintenance) |  | 19,032 | 22,337 | 17,933
Energy |  | 33,978 | 37,984 | 50,177
Raw Materials |  | 179,142 | 178,340 | 184,677
Labor and Fixed Costs |  | 61,968 | 59,796 | 54,041
Depreciation, Depletion and Amortization | [1] | 25,807 | 23,038 | 21,744
Purchased Cement |  |  |  |
Other Segment Items |  | 29,808 | 34,058 | 30,864
Segment Profit |  | 350,764 | 334,536 | 352,499
Segment Assets |  | 429,268 | 432,122 | 421,425
Recycled Paperboard [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Freight and Delivery |  | 96 |  |
Recycled Paperboard [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 122,666 | 101,837 | 108,445
Recycled Paperboard [Member] | Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 89,058 | 82,351 | 92,835
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 |  | 211,724 | 184,188 | 201,280
Capital Expenditures |  | 15,193 | 10,085 | 2,898
Freight and Delivery |  |  | 623 | 8,760
Parts, Supplies, and Services (Includes Maintenance) |  | 12,598 | 11,186 | 10,609
Energy |  | 14,035 | 17,120 | 19,914
Raw Materials |  | 94,769 | 83,784 | 95,060
Labor and Fixed Costs |  | 21,431 | 22,875 | 20,761
Depreciation, Depletion and Amortization | [1] | 14,782 | 14,811 | 14,942
Purchased Cement |  |  |  |
Other Segment Items |  | 15,935 | 2,173 | 6,014
Segment Profit |  | 38,078 | 31,616 | 25,220
Segment Assets |  | 166,673 | 170,832 | 163,797
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures |  | 3,709 | 548 | 1,630
Segment Assets |  | $ 87,396 | $ 76,081 | $ 55,786
[1] | Depreciation, Depletion, and Amortization for corporate assets was $3,249 million, $3,117 million, and $2,812 million, in fiscal 2025, 2024, and 2023, respectively. These amounts are included in Corporate General and Administrative Expense.

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