Stock-based Compensation (Details) (USD $)	6 Months Ended
Dec. 31, 2011
Stock-Based Compensation Details
Dividend yield	3.59%
Expected stock price volatility	33.82%
Risk-free interest rate	0.64%
Expected option life (in years)	3 years 7 months
Weighted average fair value per share of options granted	$ 4.757

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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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