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Retirement Benefit Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Amortization period of losses utilized under pension fund (in years) 30 years      
Percentage of non-discretionary regular matching contribution of company 100.00%      
Percentage of eligible compensation 80.00%      
Percentage of eligible compensation of deferral contribution, minimum 1.00%      
Percentage of eligible compensation of deferral contribution, maximum 6.00%      
Matching contribution expense for defined contribution plan $ 694 $ 696 $ 504  
Additional discretionary matching contribution expense $ 0 294 253  
Pension Fund Two        
Defined Benefit Plan Disclosure [Line Items]        
Withdrawal liability       $ 54
Company incurred expenses   $ 52 213  
Repair Group        
Defined Benefit Plan Disclosure [Line Items]        
Curtailment cost     $ 252