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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