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Retirement Plan and Incentive Awards - Schedule of Assumptions for Stock Options Granted (Details) (SSARs and Stock Options, USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
SSARs and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options	5 years	4 years 9 months 18 days	4 years 9 months 18 days
Expected volatility	44.77%	51.70%	50.00%
Expected discrete dividends	0.00%	0.00%	0.00%
Weighted average risk-free interest rate	0.90%	1.22%	2.33%
Weighted average fair value	$ 4.30	$ 10.50	$ 12.75

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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