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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
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Total stock-based compensation expense $ 7,610 $ 6,475 $ 5,206
Income tax benefit recorded on stock-based compensation expense $ 2,397 $ 2,266 $ 1,822