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Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
USD ($)
T
Jun. 30, 2015
USD ($)
T
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]      
Net Revenues $ 297,504 $ 284,963  
Net Revenues, including Joint Venture 322,392 311,974  
Less: Joint Venture (24,888) (27,011)  
Operating Earnings 81,010 69,362  
Corporate General and Administrative (9,833) (8,991)  
Earnings Before Interest and Income Taxes 71,177 60,371  
Interest Expense, Net (3,901) (4,486)  
Earnings Before Income Taxes 67,276 55,885  
Capital Expenditures 8,978 27,122  
Depreciation, Depletion and Amortization 22,863 24,264  
Identifiable Assets 1,889,085   $ 1,883,635
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 340,716 329,903  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net Revenues (18,324) (17,929)  
Other, net [Member]      
Segment Reporting Information [Line Items]      
Operating Earnings 1,075 435  
Depreciation, Depletion and Amortization 457 495  
Cement [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues $ 144,792 $ 128,176  
Cement Sales Volume | T 1,251 1,203  
Operating Earnings $ 31,600 $ 25,713  
Capital Expenditures 5,245 8,150  
Depreciation, Depletion and Amortization 8,611 $ 7,866  
Identifiable Assets $ 845,018   819,994
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | T 1,033 991  
Operating Earnings $ 23,620 $ 17,883  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | T 218 212  
Operating Earnings $ 7,980 $ 7,830  
Cement [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net Revenues (3,535) (3,126)  
Gypsum Wallboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 113,262 115,052  
Operating Earnings 39,336 40,894  
Capital Expenditures 1,328 1,497  
Depreciation, Depletion and Amortization 4,762 4,786  
Identifiable Assets 380,640   392,523
Paperboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 42,815 35,318  
Operating Earnings 11,227 6,030  
Capital Expenditures 1,304 844  
Depreciation, Depletion and Amortization 2,100 2,053  
Identifiable Assets 128,448   127,371
Paperboard [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net Revenues (14,506) (14,551)  
Oil and Gas Proppants [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 5,096 22,825  
Operating Earnings (5,912) (5,636)  
Capital Expenditures 57 15,967  
Depreciation, Depletion and Amortization 5,184 7,559  
Identifiable Assets 401,285   409,497
Concrete and Aggregates [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net Revenues 34,751 28,532  
Operating Earnings 3,684 1,926  
Capital Expenditures 1,044 664  
Depreciation, Depletion and Amortization 1,749 1,505  
Identifiable Assets 111,195   106,634
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net Revenues (283) $ (252)  
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Identifiable Assets $ 22,499   $ 27,616