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Financial Information Related to Operations by Segment (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) kT | Dec. 31, 2016 USD ($) kT | Dec. 31, 2017 USD ($) kT | Dec. 31, 2016 USD ($) kT | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 359,371 | $ 302,395 | $ 1,101,807 | $ 932,557 |
Net Revenues, including Joint Venture | 384,897 | 328,304 | 1,181,503 | 1,010,329 |
Less: Joint Venture | (25,526) | (25,909) | (79,696) | (77,772) |
Operating Earnings | 105,938 | 98,624 | 310,582 | 281,916 |
Corporate General and Administrative | (9,883) | (9,166) | (29,383) | (27,831) |
Legal Settlement | (39,098) |  | (39,098) |  |
Other Non-Operating Income | 1,084 | 429 | 2,728 | 2,008 |
Earnings Before Interest and Income Taxes | 58,041 | 89,887 | 244,829 | 256,093 |
Interest Expense, Net | (6,653) | (6,198) | (21,592) | (15,755) |
Earnings Before Income Taxes | 51,388 | 83,689 | 223,237 | 240,338 |
Capital Expenditures | 33,607 | 15,812 | 83,698 | 34,043 |
Depreciation, Depletion and Amortization | 28,650 | 22,645 | 87,903 | 67,894 |
Identifiable Assets | 2,308,043 |  | 2,308,043 |  | $ 2,247,124
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 408,472 | 348,772 | 1,250,992 | 1,069,452 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (23,575) | (20,468) | (69,489) | (59,123) |
Cement [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 161,601 | $ 138,047 | $ 536,186 | $ 449,650 |
Cement Sales Volume | kT | 1,339 | 1,198 | 4,420 | 3,891 |
Operating Earnings | $ 52,523 | $ 45,307 | $ 154,456 | $ 127,623 |
Capital Expenditures | 11,012 | 8,558 | 31,744 | 18,812 |
Depreciation, Depletion and Amortization | 13,117 | $ 8,763 | 38,258 | $ 26,158 |
Identifiable Assets | $ 1,233,099 |  | $ 1,233,099 |  | 1,234,617
Cement [Member] | Operating Segments [Member] | Joint Venture [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | kT | 216 | 231 | 686 | 691 |
Operating Earnings | $ 11,372 | $ 11,244 | $ 33,203 | $ 31,371 |
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cement Sales Volume | kT | 1,123 | 967 | 3,734 | 3,200 |
Operating Earnings | $ 41,151 | $ 34,063 | $ 121,253 | $ 96,252 |
Cement [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (4,160) | (4,336) | (13,743) | (12,407) |
Gypsum Wallboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 133,348 | 121,504 | 383,229 | 357,689 |
Operating Earnings | 39,841 | 41,075 | 123,237 | 122,109 |
Capital Expenditures | 4,616 | 1,756 | 15,477 | 5,181 |
Depreciation, Depletion and Amortization | 4,599 | 4,636 | 13,514 | 14,166 |
Identifiable Assets | 376,731 |  | 376,731 |  | 379,414
Paperboard [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 48,389 | 41,254 | 138,161 | 128,528 |
Operating Earnings | 10,903 | 9,380 | 22,358 | 30,827 |
Capital Expenditures | 1,490 | 634 | 2,913 | 2,338 |
Depreciation, Depletion and Amortization | 2,204 | 2,105 | 6,513 | 6,311 |
Identifiable Assets | 120,603 |  | 120,603 |  | 124,356
Paperboard [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (19,127) | (15,887) | (54,643) | (45,845) |
Oil and Gas Proppants [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 21,947 | 7,124 | 62,879 | 18,851 |
Operating Earnings | (1,007) | (1,726) | (4,787) | (11,728) |
Capital Expenditures | 13,896 | 1,469 | 28,256 | 1,534 |
Depreciation, Depletion and Amortization | 5,820 | 4,987 | 21,944 | 14,432 |
Identifiable Assets | 385,719 |  | 385,719 |  | 376,306
Concrete and Aggregates [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 38,742 | 40,843 | 126,092 | 114,734 |
Operating Earnings | 3,414 | 4,588 | 15,054 | 13,085 |
Capital Expenditures | 2,446 | 3,045 | 4,976 | 5,595 |
Depreciation, Depletion and Amortization | 2,007 | 1,805 | 5,851 | 5,474 |
Identifiable Assets | 103,631 |  | 103,631 |  | 110,413
Concrete and Aggregates [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (288) | (245) | (1,103) | (871) |
Other [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 4,445 |  | 4,445 |  |
Operating Earnings | 264 |  | 264 |  |
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital Expenditures | 147 | 350 | 332 | 583 |
Depreciation, Depletion and Amortization | 903 | $ 349 | 1,823 | $ 1,353 |
Identifiable Assets | $ 88,260 |  | $ 88,260 |  | $ 22,018

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