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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

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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