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Commitments And Contingencies (Details) - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Commitments And Contingencies [Abstract]    
Accrued Insurance $ 6,202,000 $ 6,204,000
Liability for Claims and Claims Adjustment Expense 171,000 $ 218,000
Estimated cost of completion of bonded project 50,170,000  
Loss Contingencies [Line Items]    
Loss Contingency Loss In Period 1,895,000  
Loss Contingency Receivable Current 2,500,000  
Loss Contingency Contingent Payment 1,500,000  
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 6,609,000  
Operating Lease Not Yet Commenced Commitment 962,000  
Insurance Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 6,101,000  
Vendor Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 508,000  
USAMRIID [Member]    
Loss Contingencies [Line Items]    
Unbilled Change Orders 21,000,000  
Contract Revenue Earned To Date 61,146,000  
USAMRIID [Member] | Scenario Forecast [Member]    
Loss Contingencies [Line Items]    
Unbilled Change Orders $ 4,500,000