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Income Taxes Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Statutory income tax rate 35.00% 35.00% 35.00%
IRS tax settlement 0.00% 0.00% (32.00%)
State income tax 2.00% 2.00% 2.00%
Other differences (1.00%) (1.00%) (1.00%)
Effective income tax rate 36.00% 36.00% 4.00%