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Stock Benefit Plans (Details) (USD $)	12 Months Ended
Stock Benefit Plans (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (in years)	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days
Expected volatility	55.00%	54.00%	67.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.10%	1.70%	2.40%
Grant date fair value	$ 5.31	$ 7.81	$ 9.42

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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