Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net income (loss)	$ 3,203	$ 1,092
Adjustments to reconcile net income to net cash provided (used) by operating activities, net of effects from acquisitions:
Depreciation and amortization	15,546	15,839
Deferred income tax	2,646	(4,665)
Gain on sale of property, plant and equipment	(511)	(366)
Provision for uncollectible accounts	12	900
Stock-based compensation expense	6,488	5,467
Other	295	211
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:
Accounts receivable	19,831	(23,531)
Costs and estimated earnings in excess of billings on uncompleted contracts	24,195	34,761
Inventories	(1,602)	9
Other assets and liabilities	(1,717)	(9,668)
Accounts payable	(37,697)	(45,690)
Billings on uncompleted contracts in excess of costs and estimated earnings	13,499	5,449
Accrued expenses	1,714	(5,417)
Net cash provided (used) by operating activities	45,902	(25,609)
Investing activities:
Acquisition, net of cash acquired	(1,687)	(40,819)
Acquisition of property, plant and equipment	(6,150)	(8,475)
Proceeds from asset sales	857	1,145
Net cash used by investing activities	(6,980)	(48,149)
Financing activities:
Advances under senior revolving credit facility	85,317	106,168
Repayments of advances under senior revolving credit facility	(120,862)	(62,029)
Payments of debt issuance costs	(364)	(822)
Issuances of common stock	0	234
Proceeds from issuance of common stock under employee stock purchase plan	224	253
Repurchase of common stock for payment of statutory taxes due on equity-based compensation	(627)	(2,288)
Capital contributions from noncontrolling interest	0	855
Net cash provided (used) by financing activities	(36,312)	42,371
Effect of exchange rate changes on cash and cash equivalents	470	(572)
Increase (decrease) in cash and cash equivalents	3,080	(31,959)
Cash and cash equivalents, beginning of period	43,805	71,656
Cash and cash equivalents, end of period	46,885	39,697
Supplemental disclosure of cash flow information:
Income taxes	1,231	11,679
Interest	2,065	1,266
Non-cash investing and financing activities:
Purchases of property, plant and equipment on account	$ 136	$ 846