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Financial Information Related to Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Segment Reporting Information [Line Items]      
Net Revenues $ 227,044 $ 154,042  
Operating Earnings 55,065 29,095  
Corporate General and Administrative (5,594) (5,416)  
Capital Expenditures 21,237 4,685  
Earnings Before Interest and Income Taxes 49,471 23,679  
Depreciation, Depletion and Amortization 17,221 12,661  
Interest Expense, Net (4,955) (3,765)  
Identifiable Assets 1,515,217   1,476,233
Earnings Before Income Taxes 44,516 19,914  
Joint Venture [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 28,404 23,707  
Cement [Member]
     
Segment Reporting Information [Line Items]      
Cement Sales Volume 1,241,000 848,000  
Cement [Member] | Joint Venture [Member]
     
Segment Reporting Information [Line Items]      
Operating Earnings 7,878 6,468  
Cement [Member] | Wholly-Owned Operations [Member]
     
Segment Reporting Information [Line Items]      
Operating Earnings 11,132 3,398  
Operating Segments [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 271,050 189,450  
Operating Segments [Member] | Cement [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 117,700 76,024  
Operating Earnings 19,010 9,866  
Capital Expenditures 3,767 3,996  
Depreciation, Depletion and Amortization 7,837 3,809  
Identifiable Assets 767,665   756,158
Operating Segments [Member] | Gypsum Wallboard [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 95,981 70,220  
Operating Earnings 29,636 14,022  
Capital Expenditures 1,097 196  
Depreciation, Depletion and Amortization 5,283 5,277  
Identifiable Assets 424,479   425,866
Operating Segments [Member] | Paperboard [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 32,163 30,329  
Operating Earnings 5,679 5,276  
Capital Expenditures 537 221  
Depreciation, Depletion and Amortization 2,182 2,210  
Identifiable Assets 129,304   129,229
Operating Segments [Member] | Concrete and Aggregates [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 25,206 12,877  
Operating Earnings 157 201  
Operating Segments [Member] | Aggregates [Member]
     
Segment Reporting Information [Line Items]      
Capital Expenditures 15,548 235  
Depreciation, Depletion and Amortization 1,282 887  
Identifiable Assets 130,160   108,796
Operating Segments [Member] | Concrete [Member]
     
Segment Reporting Information [Line Items]      
Capital Expenditures 288 37  
Depreciation, Depletion and Amortization 394 268  
Identifiable Assets 37,168   27,187
Operating Segments [Member] | Corporate and Other [Member]
     
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization 243 210  
Intersegment Elimination [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 15,602 11,701  
Intersegment Elimination [Member] | Cement [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 1,992 567  
Intersegment Elimination [Member] | Paperboard [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 13,212 10,922  
Intersegment Elimination [Member] | Concrete and Aggregates [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 398 212  
Net Revenue [Member]
     
Segment Reporting Information [Line Items]      
Net Revenues 255,448 177,749  
Reportable Legal Entities [Member] | Cement [Member] | Joint Venture [Member]
     
Segment Reporting Information [Line Items]      
Cement Sales Volume 262,000 227,000  
Reportable Legal Entities [Member] | Cement [Member] | Wholly-Owned Operations [Member]
     
Segment Reporting Information [Line Items]      
Cement Sales Volume 979,000 621,000  
Significant Reconciling Items [Member] | Other Net [Member]
     
Segment Reporting Information [Line Items]      
Operating Earnings 583 (270)  
Corporate Non Segment [Member] | Corporate and Other [Member]
     
Segment Reporting Information [Line Items]      
Identifiable Assets $ 26,441   $ 29,000