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Stock Based Compensation (Details 1)	3 Months Ended		9 Months Ended
Stock Based Compensation (Details 1)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of stock option plans
Risk-free interest rates	0.70%		0.80%	1.50%
Expected life (years)	4 years 9 months 18 days		4 years 9 months 18 days	4 years 9 months 18 days
Expected volatility	46.80%		49.60%	45.00%
Dividend yield	0.00%		0.00%	0.00%

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.

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