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Financial Information Related to Operations by Segment (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) kT | Sep. 30, 2016 USD ($) kT | Sep. 30, 2017 USD ($) kT | Sep. 30, 2016 USD ($) kT | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 376,315 | $ 332,658 | $ 742,436 | $ 630,162 |
Net Revenues, including Joint Venture | 402,315 | 359,633 | 796,606 | 682,025 |
Less: Joint Venture | (26,000) | (26,975) | (54,170) | (51,863) |
Operating Earnings | 108,709 | 103,357 | 204,644 | 183,292 |
Corporate General and Administrative | (9,821) | (8,832) | (19,500) | (18,665) |
Other Income | 887 | 504 | 1,644 | 1,579 |
Earnings Before Interest and Income Taxes | 99,775 | 95,029 | 186,788 | 166,206 |
Interest Expense, Net | (7,456) | (5,656) | (14,939) | (9,557) |
Earnings Before Income Taxes | 92,319 | 89,373 | 171,849 | 156,649 |
Capital Expenditures | 33,931 | 9,253 | 50,091 | 18,231 |
Depreciation, Depletion and Amortization | 30,306 | 22,386 | 59,253 | 45,249 |
Identifiable Assets | 2,321,041 |  | 2,321,041 |  | $ 2,247,124
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 425,530 | 379,964 | 842,520 | 720,680 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (23,215) | (20,331) | (45,914) | (38,655) |
Cement [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 191,650 | $ 166,811 | $ 374,585 | $ 311,603 |
Cement Sales Volume | kT | 1,570 | 1,442 | 3,081 | 2,693 |
Operating Earnings | $ 58,752 | $ 50,716 | $ 101,933 | $ 82,316 |
Capital Expenditures | 13,014 | 5,009 | 20,732 | 10,254 |
Depreciation, Depletion and Amortization | 12,662 | $ 8,784 | 25,141 | $ 17,395 |
Identifiable Assets | $ 1,244,725 |  | $ 1,244,725 |  | 1,234,617
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | kT | 227 | 242 | 470 | 460 |
Operating Earnings | $ 11,955 | $ 12,147 | $ 21,831 | $ 20,127 |
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | kT | 1,343 | 1,200 | 2,611 | 2,233 |
Operating Earnings | $ 46,797 | $ 38,569 | $ 80,102 | $ 62,189 |
Cement [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (4,654) | (4,536) | (9,583) | (8,071) |
Gypsum Wallboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 123,068 | 122,923 | 249,881 | 236,185 |
Operating Earnings | 39,575 | 41,698 | 83,396 | 81,034 |
Capital Expenditures | 5,219 | 2,097 | 10,861 | 3,425 |
Depreciation, Depletion and Amortization | 4,473 | 4,768 | 8,915 | 9,530 |
Identifiable Assets | 378,927 |  | 378,927 |  | 379,414
Paperboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 45,359 | 44,459 | 89,772 | 87,274 |
Operating Earnings | 6,517 | 10,220 | 11,455 | 21,447 |
Capital Expenditures | 659 | 400 | 1,423 | 1,704 |
Depreciation, Depletion and Amortization | 2,172 | 2,106 | 4,309 | 4,206 |
Identifiable Assets | 123,527 |  | 123,527 |  | 124,356
Paperboard [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (18,159) | (15,452) | (35,516) | (29,958) |
Oil and Gas Proppants [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 22,022 | 6,631 | 40,932 | 11,727 |
Operating Earnings | (1,754) | (4,090) | (3,780) | (10,002) |
Capital Expenditures | 13,781 | 8 | 14,360 | 65 |
Depreciation, Depletion and Amortization | 8,518 | 4,261 | 16,124 | 9,445 |
Identifiable Assets | 380,838 |  | 380,838 |  | 376,306
Concrete and Aggregates [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 43,431 | 39,140 | 87,350 | 73,891 |
Operating Earnings | 5,619 | 4,813 | 11,640 | 8,497 |
Capital Expenditures | 1,118 | 1,506 | 2,530 | 2,550 |
Depreciation, Depletion and Amortization | 1,929 | 1,920 | 3,844 | 3,669 |
Identifiable Assets | 107,831 |  | 107,831 |  | 110,413
Concrete and Aggregates [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (402) | (343) | (815) | (626) |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital Expenditures | 140 | 233 | 185 | 233 |
Depreciation, Depletion and Amortization | 552 | $ 547 | 920 | $ 1,004 |
Identifiable Assets | $ 85,193 |  | $ 85,193 |  | $ 22,018

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