Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Accrued Insurance, Current	$ 6,121	$ 6,683
Liability for Claims and Claims Adjustment Expense	74	90
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	7,733
Estimated cost of completion of bonded projects	98,656
Insurance Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	7,533	6,268
Vendor Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	$ 200	$ 200