Commitments and Contingencies (Details) - USD ($)		6 Months Ended
	Nov. 10, 2021	Mar. 31, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Loss contingency, reserve	$ 350	$ 1,800
Trade accounts receivable		9,700
Accrued Insurance, Current		6,039,000	$ 5,787,000
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount		4,161,000
Estimated cost of completion of bonded projects		125,880,000
Purchase Commitment, Remaining Minimum Amount Committed		12,058,000
Insurance Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount		$ 3,962,000	$ 4,327,000