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Stock-Based Compensation (Black-Scholes Assumptions Used To Estimate Fair Value Of SARs) (Details) (Officer [Member], Stock Appreciation Rights (SARs) [Member])	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Officer [Member] \| Stock Appreciation Rights (SARs) [Member]
Expected term (in years)	5.0	5.0
Expected volatility	35.80%	35.30%
Expected dividend yield	5.07%	4.73%
Risk-free interest rate	1.66%	2.36%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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