Stock-Based Compensation (Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards) (Details) (Stock Options [Member])	3 Months Ended	9 Months Ended
Jun. 30, 2011 years	Jun. 30, 2010 years	Jun. 30, 2010 years	Jun. 30, 2011 Minimum [Member] years	Jun. 30, 2011 Maximum [Member] years
Expected term	5.8	6.5	6.5	5.8	8.7
Estimated volatility	53.70%	51.00%	51.00%	48.00%	54.00%
Estimated dividend yield	1.00%	1.40%	1.40%	1.00%	1.30%
Risk-free interest rate	1.80%	2.40%	3.40%	1.80%	2.60%
Forfeiture rate	10.60%	10.80%	8.10%	0.00%	10.60%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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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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