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Share-based Compensation - Weighted-average Assumptions Using Black-Scholes Model (Details) (USD $)	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average fair value of options	$ 5.54	$ 3.64
Risk-free interest rate	0.80%	1.10%
Dividend yield	0.00%	0.00%
Average expected life	6 years	6 years
Expected stock price volatility	49.50%	52.50%

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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