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Fair Value Assumptions for Stock Option Plan (Detail)	3 Months Ended		9 Months Ended
Fair Value Assumptions for Stock Option Plan (Detail)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Fair Value Option [Line Items]
Risk-free interest rate	1.10%	0.77%	0.94%	1.05%
Expected volatility	48.00%	49.00%	49.00%	59.00%
Expected life of options	4 years 8 months 12 days	4 years 6 months	5 years 8 months 12 days	5 years 6 months
Dividend yield

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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