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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Net income (loss)	$ 33,478	$ (13,803)	$ 13,594
Bad debt expense	552	421	296
Deferred financing cost amortization	318	288	294
Depreciation and amortization	9,557	8,860	9,634
Loss (gain) on sale of assets	(52)	15	69
Share-based Payment Arrangement, Noncash Expense	2,357	(136)	1,707
Deferred income taxes	5,681	38,151	6,899
Accounts receivable	(35,254)	(7,574)	(7,621)
Inventories	(684)	(3,970)	(1,856)
Costs and estimated earnings in excess of billings	1,586	(17,840)	2,571
Prepaid expenses and other current assets	(7,171)	(2,250)	(6,798)
Other non-current assets	(444)	274	(510)
Accounts payable and accrued expenses	22,472	6,584	(2,829)
Billings in excess of costs and estimated earnings	6,683	3,570	5,898
Other non-current liabilities	(459)	(336)	1,139
Net cash provided by operating activities	38,724	12,224	22,349
Purchases of property and equipment	6,300	4,563	4,589
Proceeds from sale of assets	502	108	270
Cash paid in conjunction with business combinations	50	(7,406)	(20,213)
Net cash used in investing activities	(5,748)	(11,861)	(24,532)
Borrowings of debt	89,261	168	5,434
Repayments of debt	(119,508)	(177)	(5,432)
Payment for Contingent Consideration Liability, Financing Activities	0	0	(448)
Distribution to noncontrolling interests	(240)	(349)	(153)
Purchase of treasury stock	(9,802)	(2,059)	(2,367)
Options exercised	0	11	218
Net cash used in financing activities	(40,289)	(2,406)	(2,748)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(7,313)	(2,043)	(4,931)
CASH, CASH EQUIVALENTS and RESTRiCTED CASH, beginning of period	26,247	28,290	33,221
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period	18,934	26,247	28,290
Cash paid for interest	1,743	1,684	1,521
Cash paid for income taxes (net)	$ 1,370	$ 2,839	$ 2,429

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