Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (13,803)	$ 13,594	$ 120,878
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Bad debt expense	421	296	360
Deferred financing cost amortization	288	294	345
Depreciation and amortization	8,860	9,634	5,664
Loss (gain) on sale of assets	(15)	(69)	810
Non-cash compensation expense	(136)	1,707	1,583
Deferred income taxes	38,151	6,899	(98,402)
Changes in operating assets and liabilities
Accounts receivable	(7,574)	(7,621)	(22,439)
Inventories	(3,970)	(1,856)	3,897
Costs and estimated earnings in excess of billings	(17,840)	2,571	(3,236)
Prepaid expenses and other current assets	(2,250)	(6,798)	(1,716)
Other non-current assets	274	(510)	(1,500)
Accounts payable and accrued expenses	6,584	(2,829)	19,676
Billings in excess of costs and estimated earnings	3,570	5,898	(936)
Other non-current liabilities	(336)	1,139	(16)
Net cash provided by operating activities	12,224	22,349	24,968
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(4,563)	(4,589)	(3,417)
Proceeds from sales of assets	108	270	2,225
Cash paid in conjunction with business combinations	(7,406)	(20,213)	(59,544)
Net cash used in investing activities	(11,861)	(24,532)	(60,736)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of debt	168	5,434	20,289
Repayments of debt	(177)	(5,432)	(290)
Contingent consideration payment	0	(448)	0
Distribution to noncontrolling interest	(349)	(153)	0
Purchase of treasury stock	(2,059)	(2,367)	(590)
Issuance of shares	11	218	220
Net cash provided by (used in) financing activities	(2,406)	(2,748)	19,629
NET DECREASE IN CASH AND CASH EQUIVALENTS	(2,043)	(4,931)	(16,139)
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	1,684	1,521	1,009
Cash paid for income taxes (net)	$ 2,839	$ 2,429	$ 1,415