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Financial Information Related to Operations by Segment (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) T | Sep. 30, 2014 USD ($) T | Sep. 30, 2015 USD ($) T | Sep. 30, 2014 USD ($) T | Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 328,988 | $ 284,808 | $ 613,951 | $ 551,059 |
Net Revenues, including Joint Venture | 358,524 | 317,947 | 670,498 | 616,776 |
Less: Joint Venture | (29,536) | (33,139) | (56,547) | (65,717) |
Operating Earnings | 56,546 | 87,995 | 125,908 | 154,875 |
Corporate General and Administrative | (9,364) | (7,414) | (18,355) | (14,456) |
Acquisition and Litigation Expense |  | (2,103) |  | (2,103) |
Earnings Before Interest and Income Taxes | 47,182 | 78,478 | 107,553 | 138,316 |
Interest Expense, Net | (4,342) | (3,901) | (8,828) | (7,953) |
Earnings Before Income Taxes | 42,840 | 74,577 | 98,725 | 130,363 |
Capital Expenditures | 28,747 | 16,858 | 55,869 | 40,039 |
Depreciation, Depletion and Amortization | 24,770 | 17,574 | 49,034 | 34,864 |
Identifiable Assets | 1,920,250 |  | 1,920,250 |  | $ 1,882,591
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 378,614 | 335,470 | 708,517 | 650,904 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (20,090) | (17,523) | (38,019) | (34,128) |
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Earnings | 572 | 883 | 1,007 | 1,562 |
Capital Expenditures |  | 82 |  | 150 |
Depreciation, Depletion and Amortization | 489 | 445 | 984 | 892 |
Cement [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 164,790 | $ 145,861 | $ 292,966 | $ 273,797 |
Cement Sales Volume | T | 1,484 | 1,476 | 2,687 | 2,767 |
Operating Earnings | $ 48,577 | $ 38,450 | $ 74,290 | $ 58,957 |
Capital Expenditures | 5,349 | 4,176 | 13,499 | 12,996 |
Depreciation, Depletion and Amortization | 8,629 | $ 7,987 | 16,495 | $ 15,870 |
Identifiable Assets | $ 836,927 |  | $ 836,927 |  | 777,956
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 1,248 | 1,193 | 2,239 | 2,200 |
Operating Earnings | $ 36,897 | $ 26,399 | $ 54,780 | $ 37,106 |
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 236 | 283 | 448 | 567 |
Operating Earnings | $ 11,680 | $ 12,051 | $ 19,510 | $ 21,851 |
Cement [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (4,232) | (2,911) | (7,358) | (5,271) |
Gypsum Wallboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 119,701 | 111,655 | 234,753 | 224,332 |
Operating Earnings | 40,002 | 37,002 | 80,896 | 74,430 |
Capital Expenditures | 203 | 1,558 | 1,700 | 3,793 |
Depreciation, Depletion and Amortization | 4,819 | 5,031 | 9,605 | 10,129 |
Identifiable Assets | 393,602 |  | 393,602 |  | 403,279
Paperboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 39,145 | 35,579 | 74,463 | 73,058 |
Operating Earnings | 8,138 | 7,984 | 14,168 | 15,531 |
Capital Expenditures | 2,424 | 823 | 3,268 | 1,149 |
Depreciation, Depletion and Amortization | 2,063 | 2,058 | 4,116 | 4,127 |
Identifiable Assets | 126,497 |  | 126,497 |  | 123,519
Paperboard [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (15,596) | (14,324) | (30,147) | (28,340) |
Oil and Gas Proppants [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 18,307 | 10,414 | 41,132 | 21,594 |
Operating Earnings | (44,600) | 711 | (50,236) | 74 |
Capital Expenditures | 16,744 | 6,000 | 32,711 | 13,602 |
Depreciation, Depletion and Amortization | 7,205 | 684 | 14,764 | 1,253 |
Identifiable Assets | 434,093 |  | 434,093 |  | 455,572
Concrete and Aggregates [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 36,671 | 31,961 | 65,203 | 58,123 |
Operating Earnings | 3,857 | 2,965 | 5,783 | 4,321 |
Capital Expenditures | 4,027 | 4,219 | 4,691 | 8,349 |
Depreciation, Depletion and Amortization | 1,565 | 1,369 | 3,070 | 2,593 |
Identifiable Assets | 109,154 |  | 109,154 |  | 96,610
Concrete and Aggregates [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (262) | $ (288) | (514) | $ (517) |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Identifiable Assets | $ 19,977 |  | $ 19,977 |  | $ 25,655

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