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Financial Information Related to Operations by Segment (Detail)
$ in Thousands
 3 Months Ended
Jun. 30, 2021
USD ($)
kT
Jun. 30, 2020
USD ($)
kT
Mar. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Revenue $ 475,770 $ 426,989  
Less: Joint Venture Revenue (22,691) (25,300)  
Operating Earnings 134,481 110,093  
Corporate General and Administrative Expense (9,468) (17,789)  
Gain on Sale of Businesses   51,973  
Other Non-Operating Income (Loss) 3,678 (309)  
Earnings Before Interest and Income Taxes 128,691 143,968  
Interest Expense, net (6,972) (14,041)  
Earnings Before Income Taxes 121,719 129,927  
Capital Expenditures 11,935 25,991  
Depreciation, Depletion and Amortization 31,944 31,937  
Depreciation and Amortization   121  
Identifiable Assets 2,890,830   $ 2,838,681
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 524,543 472,495  
Depreciation, Depletion and Amortization 31,944 31,816  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue (26,082) (20,206)  
Revenue (26,082) (20,206)  
Cement [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 270,255 $ 261,411  
Cement Sales Volume | kT 2,036 2,085  
Operating Earnings $ 62,547 $ 60,455  
Capital Expenditures 7,967 10,348  
Depreciation, Depletion and Amortization 19,531 $ 19,243  
Identifiable Assets $ 1,902,811   1,898,930
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kT 1,852 1,866  
Operating Earnings $ 54,577 $ 52,659  
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]      
Segment Reporting Information [Line Items]      
Cement Sales Volume | kT 184 219  
Operating Earnings $ 7,970 $ 7,796  
Cement [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue (7,833) (6,031)  
Concrete and Aggregates [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 44,754 44,190  
Operating Earnings 5,344 5,418  
Capital Expenditures 546 1,261  
Depreciation, Depletion and Amortization 2,578 2,721  
Identifiable Assets 91,306   88,410
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue   (106)  
Gypsum Wallboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 166,267 130,150  
Operating Earnings 63,253 41,325  
Capital Expenditures 1,694 6,512  
Depreciation, Depletion and Amortization 5,396 5,200  
Identifiable Assets 365,084   366,352
Paperboard [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue 43,267 36,744  
Operating Earnings 3,337 2,895  
Capital Expenditures 1,117 7,870  
Depreciation, Depletion and Amortization 3,668 3,352  
Identifiable Assets 185,287   186,156
Paperboard [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue (18,249) (14,069)  
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Capital Expenditures 611    
Depreciation, Depletion and Amortization 771 $ 1,300  
Identifiable Assets $ 346,342   $ 298,833