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Share-Based Payments (Detail) - Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Term	7 years 109 days	6 years 219 days
Volatility	59.20%	59.50%
Dividend yield	0.00%	0.00%
Risk-free interest rate	1.20%	1.50%

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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