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Segment Information (Schedule Of Financial Information Related To Operations By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]        
Revenues, Sub-total $ 155,824 $ 133,089 $ 477,040 $ 454,069
Less: Intersegment Revenues (11,595) (10,038) (34,331) (31,321)
Revenues, including Joint Venture 144,229 123,051 442,709 422,748
Less: Joint Venture (20,633) (19,181) (64,487) (55,949)
Net Revenues 123,596 103,870 378,222 366,799
Cement [Member]
       
Segment Reporting Information [Line Items]        
Revenues, Sub-total 61,510 54,876 194,208 185,151
Less: Intersegment Revenues (803) (1,394) (3,044) (3,550)
Gypsum Wallboard [Member]
       
Segment Reporting Information [Line Items]        
Revenues, Sub-total 54,063 45,389 156,386 153,903
Paperboard [Member]
       
Segment Reporting Information [Line Items]        
Revenues, Sub-total 30,001 22,381 90,414 80,309
Less: Intersegment Revenues (10,594) (8,491) (30,728) (27,311)
Concrete And Aggregates [Member]
       
Segment Reporting Information [Line Items]        
Revenues, Sub-total 10,250 10,443 36,032 34,706
Less: Intersegment Revenues $ (198) $ (153) $ (559) $ (460)