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Commitments And Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2018 | Aug. 31, 2017 | Sep. 30, 2016
Commitments And Contingencies [Abstract] |  |  |  |
Accrued Insurance | $ 6,204 |  |  | $ 5,464
Liability for Claims and Claims Adjustment Expense | 218 |  |  | $ 235
Estimated cost of completion of bonded project | 35,389 |  |  |
Other Commitments [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | 6,493 |  |  |
Insurance Related [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | 5,985 |  |  |
Vendor Related [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | $ 508 |  |  |
USAMRIID [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Name Of Plaintiff | IES Commercial, Inc. |  |  |
Loss Contingency Opinion Of Counsel | Given the uncertainty litigation poses, the Company has not recorded any recovery in connection with this claim. There can be no assurance that the Company will prevail in this litigation matter or that, if the Company does prevail, it will receive an amount substantially similar to the amount sought or not receive a significantly lower award. |  |  |
Unbilled Change Orders |  |  | $ 21,000 |
Contract Revenue Earned To Date | $ 61,146 |  |  |
USAMRIID [Member] | Scenario Forecast [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Unbilled Change Orders |  | $ 4,500 |  |

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