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Segment Information (Schedule Of Identifiable Assets) (Details) (USD $)
In Thousands
Sep. 30, 2011
Mar. 31, 2011
Segment Information [Line Items]  
Identifiable Assets, Total$ 990,133[1]$ 982,810[1]
Cement [Member]
  
Segment Information [Line Items]  
Identifiable Assets, Total316,091[1]304,693[1]
Gypsum Wallboard [Member]
  
Segment Information [Line Items]  
Identifiable Assets, Total436,024[1]443,174[1]
Paperboard [Member]
  
Segment Information [Line Items]  
Identifiable Assets, Total141,563[1]144,434[1]
Concrete And Aggregates [Member]
  
Segment Information [Line Items]  
Identifiable Assets, Total54,048[1]51,797[1]
Corporate And Other [Member]
  
Segment Information [Line Items]  
Identifiable Assets, Total$ 42,407[1]$ 38,712[1]
[1] Basis conforms with equity method accounting.