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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