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Financial Information Related to Operations by Segment (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) T | Sep. 30, 2015 USD ($) T | Sep. 30, 2016 USD ($) T | Sep. 30, 2015 USD ($) T | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 332,658 | $ 328,988 | $ 630,162 | $ 613,951 |
Net Revenues, including Joint Venture | 359,633 | 358,524 | 682,025 | 670,498 |
Less: Joint Venture | (26,975) | (29,536) | (51,863) | (56,547) |
Operating Earnings | 103,861 | 56,546 | 184,871 | 125,908 |
Corporate General and Administrative | (8,832) | (9,364) | (18,665) | (18,355) |
Earnings Before Interest and Income Taxes | 95,029 | 47,182 | 166,206 | 107,553 |
Interest Expense, Net | (5,656) | (4,342) | (9,557) | (8,828) |
Earnings Before Income Taxes | 89,373 | 42,840 | 156,649 | 98,725 |
Capital Expenditures | 9,253 | 28,747 | 18,231 | 55,869 |
Depreciation, Depletion and Amortization | 22,386 | 24,770 | 45,249 | 49,034 |
Identifiable Assets | 1,908,135 |  | 1,908,135 |  | $ 1,883,635
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 379,964 | 378,614 | 720,680 | 708,517 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (20,331) | (20,090) | (38,655) | (38,019) |
Other, net [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Earnings | 504 | 572 | 1,579 | 1,007 |
Capital Expenditures | 233 |  | 233 |  |
Depreciation, Depletion and Amortization | 547 | 489 | 1,004 | 984 |
Cement [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 166,811 | $ 164,790 | $ 311,603 | $ 292,966 |
Cement Sales Volume | T | 1,442 | 1,484 | 2,693 | 2,687 |
Operating Earnings | $ 50,716 | $ 48,577 | $ 82,316 | $ 74,290 |
Capital Expenditures | 5,009 | 5,349 | 10,254 | 13,499 |
Depreciation, Depletion and Amortization | 8,784 | $ 8,629 | 17,395 | $ 16,495 |
Identifiable Assets | $ 833,219 |  | $ 833,219 |  | 819,994
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 1,200 | 1,248 | 2,233 | 2,239 |
Operating Earnings | $ 38,569 | $ 36,897 | $ 62,189 | $ 54,780 |
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 242 | 236 | 460 | 448 |
Operating Earnings | $ 12,147 | $ 11,680 | $ 20,127 | $ 19,510 |
Cement [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (4,536) | (4,232) | (8,071) | (7,358) |
Gypsum Wallboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 122,923 | 119,701 | 236,185 | 234,753 |
Operating Earnings | 41,698 | 40,002 | 81,034 | 80,896 |
Capital Expenditures | 2,097 | 203 | 3,425 | 1,700 |
Depreciation, Depletion and Amortization | 4,768 | 4,819 | 9,530 | 9,605 |
Identifiable Assets | 378,905 |  | 378,905 |  | 392,523
Paperboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 44,459 | 39,145 | 87,274 | 74,463 |
Operating Earnings | 10,220 | 8,138 | 21,447 | 14,168 |
Capital Expenditures | 400 | 2,424 | 1,704 | 3,268 |
Depreciation, Depletion and Amortization | 2,106 | 2,063 | 4,206 | 4,116 |
Identifiable Assets | 123,124 |  | 123,124 |  | 127,371
Paperboard [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (15,452) | (15,596) | (29,958) | (30,147) |
Oil and Gas Proppants [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 6,631 | 18,307 | 11,727 | 41,132 |
Operating Earnings | (4,090) | (44,600) | (10,002) | (50,236) |
Capital Expenditures | 8 | 16,744 | 65 | 32,711 |
Depreciation, Depletion and Amortization | 4,261 | 7,205 | 9,445 | 14,764 |
Identifiable Assets | 390,915 |  | 390,915 |  | 409,497
Concrete and Aggregates [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 39,140 | 36,671 | 73,891 | 65,203 |
Operating Earnings | 4,813 | 3,857 | 8,497 | 5,783 |
Capital Expenditures | 1,506 | 4,027 | 2,550 | 4,691 |
Depreciation, Depletion and Amortization | 1,920 | 1,565 | 3,669 | 3,070 |
Identifiable Assets | 109,683 |  | 109,683 |  | 106,634
Concrete and Aggregates [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (343) | $ (262) | (626) | $ (514) |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Identifiable Assets | $ 72,289 |  | $ 72,289 |  | $ 27,616

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