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Executive Stock Plans And Stock-Based Compensation (Assumptions Used To Estimate Grant Date Fair Value Of SARs) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term, years	5 years	5 years
Expected volatility	35.80%	35.30%
Expected dividend yield	5.07%	4.73%
Risk-free interest rate	1.66%	2.36%
Resulting fair value of SARs granted	$ 7.46	$ 8.35

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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