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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