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Income Taxes - Unrecognized Tax Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Income Taxes [Abstract]    
Unrecognized Tax Benefits Beginning Balance $ 56,079 $ 55,612
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions 98 468
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions 1 2
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations 198 3
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities 17 0
Unrecognized Tax Benefits Ending Balance $ 55,963 $ 56,079