Commitments And Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Commitments And Contingencies [Abstract]
Accrued Insurance	$ 6,021	$ 6,202
Liability for Claims and Claims Adjustment Expense	87	171
Estimated cost of completion of bonded project	77,025
Insurance Related [Member]
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	6,351	6,101
Vendor Related [Member]
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	$ 200	$ 508