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Financial Information Related to Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Segment Reporting Information [Line Items]          
Revenues, Sub-total $ 201,204 $ 155,824 $ 592,501 $ 477,040  
Intersegment Revenues (12,461) (11,595) (37,434) (34,331)  
Net Revenues, including Joint Venture 188,743 144,229 555,067 442,709  
Less: Joint Venture (24,000) (20,633) (71,623) (64,487)  
Net Revenues 164,743 123,596 483,444 378,222  
Operating Earnings 39,890 20,838 110,290 47,348  
Corporate General and Administrative (6,268) (4,928) (16,942) (13,518)  
Capital Expenditures 20,204 15,428 28,832 22,944  
Acquisition and Litigation Expense (2,485) (9,117) (8,859) (9,117)  
Depreciation, Depletion and Amortization 14,336 12,671 39,780 37,354  
Earnings Before Interest and Income Taxes 31,137 6,793 84,489 24,713  
Identifiable Assets 1,456,820   1,456,820   985,145
Loss on Debt Retirement   (2,094)   (2,094)  
Interest Expense, net (3,836) (4,210) (11,149) (13,352)  
Earnings Before Income Taxes 27,301 489 73,340 9,267  
Cement
         
Segment Reporting Information [Line Items]          
Revenues, Sub-total 74,935 61,510 229,492 194,208  
Intersegment Revenues 535 803 1,614 3,044  
Cement Sales Volume (in thousands of tons) 818,000 700,000 2,530,000 2,191,000  
Operating Earnings 16,615 15,493 43,923 39,392  
Capital Expenditures 3,851 1,723 8,798 5,931  
Depreciation, Depletion and Amortization 5,258 3,821 12,991 11,254  
Identifiable Assets 744,570   744,570   313,559
Cement | Wholly-Owned Operations
         
Segment Reporting Information [Line Items]          
Cement Sales Volume (in thousands of tons) 592,000 497,000 1,852,000 1,534,000  
Operating Earnings 7,763 7,717 19,853 18,232  
Cement | Joint Venture
         
Segment Reporting Information [Line Items]          
Cement Sales Volume (in thousands of tons) 226,000 203,000 678,000 657,000  
Operating Earnings 8,852 7,776 24,070 21,160  
Gypsum Wallboard
         
Segment Reporting Information [Line Items]          
Revenues, Sub-total 80,737 54,063 228,284 156,386  
Operating Earnings 16,870 228 47,356 (4,074)  
Capital Expenditures 744 1,174 2,208 3,188  
Depreciation, Depletion and Amortization 5,252 5,314 15,798 15,798  
Identifiable Assets 425,675   425,675   434,967
Paperboard
         
Segment Reporting Information [Line Items]          
Revenues, Sub-total 31,331 30,001 93,390 90,414  
Intersegment Revenues 11,780 10,594 35,217 30,728  
Operating Earnings 7,963 5,146 20,934 12,214  
Capital Expenditures 47 532 413 754  
Depreciation, Depletion and Amortization 2,207 2,131 6,626 6,383  
Identifiable Assets 131,999   131,999   137,483
Concrete and Aggregates
         
Segment Reporting Information [Line Items]          
Revenues, Sub-total 14,201 10,250 41,335 36,032  
Intersegment Revenues 146 198 603 559  
Operating Earnings (1,335) (620) (1,496) (811)  
Other, net
         
Segment Reporting Information [Line Items]          
Operating Earnings (223) 591 (427) 627  
Capital Expenditures 2   9 49  
Identifiable Assets 21,193   21,193   38,096
Depreciation, Depletion and Amortization 352 294 778 684  
Aggregates
         
Segment Reporting Information [Line Items]          
Capital Expenditures 15,560 11,870 17,380 12,751  
Depreciation, Depletion and Amortization 866 851 2,650 2,477  
Identifiable Assets 101,662   101,662   49,009
Concrete
         
Segment Reporting Information [Line Items]          
Capital Expenditures   129 24 271  
Depreciation, Depletion and Amortization 401 260 937 758  
Identifiable Assets $ 32,721   $ 32,721   $ 12,031