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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, 2012
Mar. 31, 2011
Mar. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total stock-based compensation expense $ 5,987 $ 5,893 $ 6,133
Income tax benefit recorded on stock-based compensation expense $ 2,095 $ 2,063 $ 2,147