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Commitments And Contingencies (Schedule Of Insurance Accruals And Payments) (Details) (USD $)
In Thousands
3 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2009
Mar. 31, 2009
Commitments And Contingencies [Abstract]      
Accrual Balances at Beginning of Period $ 6,264 $ 6,639$ 6,448$ 6,384
Insurance Expense Accrued1877921,1531,546  
Payments(157)(394)(1,498)(1,084)  
Accrual Balance at End of Period$ 6,294$ 6,846$ 6,294$ 6,846$ 6,448$ 6,384