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Executive Stock Plans And Stock-Based Compensation (Stock-Based Compensation Expense And Related Income Tax Benefit Recognized) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Total stock-based compensation expense $ 6,171 $ 5,987 $ 5,893
Income tax benefit recorded on stock-based compensation expense $ 2,160 $ 2,095 $ 2,063