XML 57 R45.htm IDEA: XBRL DOCUMENT

Fair Values of Stock Option Awards Weighted Average Assumptions (Detail)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in Years)	6 years 7 months 24 days	6 years 8 months 1 day	6 years 9 months 7 days
Expected volatility	42.27%	41.88%	41.06%
Risk-free interest rate	1.52%	1.99%	3.02%
Dividend yield	0.38%	0.29%	0.31%
Pre-vesting forfeiture rate	5.00%	5.00%	5.00%

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.

+ References+ Details