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Financial Information Related to Operations by Segment (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) T | Dec. 31, 2015 USD ($) T | Dec. 31, 2016 USD ($) T | Dec. 31, 2015 USD ($) T | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 302,395 | $ 277,409 | $ 932,557 | $ 891,360 |
Net Revenues, including Joint Venture | 328,304 | 303,417 | 1,010,329 | 973,915 |
Less: Joint Venture | (25,909) | (26,008) | (77,772) | (82,555) |
Operating Earnings | 99,053 | 80,511 | 283,924 | 206,419 |
Corporate General and Administrative | (9,166) | (8,304) | (27,831) | (26,659) |
Earnings Before Interest and Income Taxes | 89,887 | 72,207 | 256,093 | 179,760 |
Interest Expense, Net | (6,198) | (4,002) | (15,755) | (12,830) |
Earnings Before Income Taxes | 83,689 | 68,205 | 240,338 | 166,930 |
Capital Expenditures | 15,812 | 19,667 | 34,043 | 75,536 |
Depreciation, Depletion and Amortization | 22,645 | 25,211 | 67,894 | 74,245 |
Identifiable Assets | 1,973,989 |  | 1,973,989 |  | $ 1,883,635
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 348,772 | 321,403 | 1,069,452 | 1,029,920 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (20,468) | (17,986) | (59,123) | (56,005) |
Other, net [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Earnings | 429 | 1,163 | 2,008 | 2,170 |
Capital Expenditures | 350 |  | 583 |  |
Depreciation, Depletion and Amortization | 349 | 476 | 1,353 | 1,460 |
Cement [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | $ 138,047 | $ 135,419 | $ 449,650 | $ 428,385 |
Cement Sales Volume | T | 1,198 | 1,212 | 3,891 | 3,899 |
Operating Earnings | $ 45,307 | $ 41,768 | $ 127,623 | $ 116,058 |
Capital Expenditures | 8,558 | 3,206 | 18,812 | 16,705 |
Depreciation, Depletion and Amortization | 8,763 | $ 8,390 | 26,158 | $ 24,885 |
Identifiable Assets | $ 807,008 |  | $ 807,008 |  | 819,994
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 967 | 999 | 3,200 | 3,238 |
Operating Earnings | $ 34,063 | $ 31,285 | $ 96,252 | $ 86,065 |
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | T | 231 | 213 | 691 | 661 |
Operating Earnings | $ 11,244 | $ 10,483 | $ 31,371 | $ 29,993 |
Cement [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (4,336) | (3,714) | (12,407) | (11,072) |
Gypsum Wallboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 121,504 | 108,907 | 357,689 | 343,660 |
Operating Earnings | 41,075 | 37,289 | 122,109 | 118,185 |
Capital Expenditures | 1,756 | 1,131 | 5,181 | 2,831 |
Depreciation, Depletion and Amortization | 4,636 | 5,445 | 14,166 | 15,050 |
Identifiable Assets | 368,153 |  | 368,153 |  | 392,523
Paperboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 41,254 | 36,822 | 128,528 | 111,285 |
Operating Earnings | 9,380 | 7,923 | 30,827 | 22,091 |
Capital Expenditures | 634 | 650 | 2,338 | 3,918 |
Depreciation, Depletion and Amortization | 2,105 | 2,093 | 6,311 | 6,209 |
Identifiable Assets | 121,358 |  | 121,358 |  | 127,371
Paperboard [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (15,887) | (14,069) | (45,845) | (44,216) |
Oil and Gas Proppants [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 7,124 | 8,476 | 18,851 | 49,608 |
Operating Earnings | (1,726) | (9,153) | (11,728) | (59,389) |
Capital Expenditures | 1,469 | 5,619 | 1,534 | 38,330 |
Depreciation, Depletion and Amortization | 4,987 | 7,210 | 14,432 | 21,974 |
Identifiable Assets | 390,116 |  | 390,116 |  | 409,497
Concrete and Aggregates [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | 40,843 | 31,779 | 114,734 | 96,982 |
Operating Earnings | 4,588 | 1,521 | 13,085 | 7,304 |
Capital Expenditures | 3,045 | 9,061 | 5,595 | 13,752 |
Depreciation, Depletion and Amortization | 1,805 | 1,597 | 5,474 | 4,667 |
Identifiable Assets | 106,744 |  | 106,744 |  | 106,634
Concrete and Aggregates [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Revenues | (245) | $ (203) | (871) | $ (717) |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Identifiable Assets | $ 180,610 |  | $ 180,610 |  | $ 27,616

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