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Stock Plans And Stock-Based Compensation (Details) (2003 Stock Option Plan, USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
2003 Stock Option Plan
   
Allocated Share-based Compensation Expense $ 1,000 $ 5,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 4,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes based stock option valuation model.  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0