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Segment Information (Schedule Of Financial Information Related To Intersegment Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Segment Information [Line Items]    
Intersegment Revenues$ 11,875$ 10,208$ 22,736$ 21,283
Sales Volume8177751,4911,477
Operating Earnings, Other, net11517536892
Operating Earnings, Sub-total16,76817,88429,51041,544
Corporate General and Administrative(4,472)(4,415)(8,590)(8,118)
Earnings Before Interest and Taxes12,29613,46920,92033,426
Interest Expense, Net(4,557)(3,148)(9,142)(8,438)
Earnings Before Income Taxes7,73910,32111,77824,988
Capital Expenditure, Other 55[1]49[1]79[1]
Capital Expenditure, Total3,704[1]2,227[1]7,516[1]5,467[1]
Depreciation, Depletion and Amortization, Other, net203[1]128[1]390[1]278[1]
Depreciation, Depletion and Amortization, Total12,363[1]12,389[1]24,683[1]24,839[1]
Cement [Member]
    
Segment Information [Line Items]    
Intersegment Revenues1,2021,1642,2412,156
Operating Earnings, Other, net15,11112,12723,89925,760
Capital Expenditure, Other2,088[1]1,160[1]4,208[1]3,279[1]
Depreciation, Depletion and Amortization, Other, net3,703[1]3,606[1]7,433[1]7,340[1]
Cement [Member] | Wholly-Owned Operations [Member]
    
Segment Information [Line Items]    
Operating Earnings, Other, net7,1757,96710,51515,088
Cement [Member] | Joint Venture [Member]
    
Segment Information [Line Items]    
Operating Earnings, Other, net7,9364,16013,38410,672
Gypsum Wallboard [Member]
    
Segment Information [Line Items]    
Operating Earnings, Other, net(2,540)1,295(1,302)6,496
Capital Expenditure, Other701[1]435[1]2,014[1]555[1]
Depreciation, Depletion and Amortization, Other, net5,267[1]5,456[1]10,484[1]10,922[1]
Paperboard [Member]
    
Segment Information [Line Items]    
Intersegment Revenues10,4528,85720,13418,820
Operating Earnings, Other, net4,0383,8337,0687,627
Capital Expenditure, Other104[1] 222[1]57[1]
Depreciation, Depletion and Amortization, Other, net2,127[1]2,260[1]4,252[1]4,519[1]
Concrete And Aggregates [Member]
    
Segment Information [Line Items]    
Intersegment Revenues221187361307
Operating Earnings, Other, net44454(191)769
Capital Expenditure, Other811[1]577[1]1,023[1]1,497[1]
Depreciation, Depletion and Amortization, Other, net$ 1,063[1]$ 939[1]$ 2,124[1]$ 1,780[1]
Wholly-Owned Operations [Member]
    
Segment Information [Line Items]    
Sales Volume5885761,0371,074
Joint Venture [Member]
    
Segment Information [Line Items]    
Sales Volume229199454403
[1] Basis conforms with equity method accounting.