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Income Taxes (Details)	3 Months Ended		6 Months Ended
Income Taxes (Details)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Statutory federal tax rate (as a percent)	35.00%	35.00%	35.00%	35.00%
Effective tax rate (as a percent)	34.50%	34.20%	31.60%	34.40%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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