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Income Taxes - Additional Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating Loss Carryforwards [Line Items]        
Income tax (benefit) expense allocated to discontinued operations $ (15,100) $ (16,400) $ (17,000)  
Increase to the valuation allowance 1,500      
Undistributed losses of foreign subsidiaries 11,000      
Undistributed earnings of foreign subsidiaries, estimated taxes recognized upon distribution 500      
Unrecognized tax benefits 6,058 $ 6,058 $ 4,402 $ 1,432
State Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforward 89,000      
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforward 18,500      
Tax credit carryforward $ 2,700