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Segment Information (Schedule Of Summarized Financial Information For The Joint Venture Not Consolidated) (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 $ 123,596 $ 103,870 $ 378,222 $ 366,799
Gross Margin 12,471 7,840 25,561 37,820
Joint Venture [Member]
       
Segment Reporting Information [Line Items]        
Revenues 35,558 33,950 113,353 100,253
Gross Margin 16,487 15,459 45,439 38,820
Earnings Before Income Taxes $ 15,552 $ 14,391 $ 42,320 $ 35,736