Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income (loss)	$ 138	$ 25,537	$ (1,898)
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions :
Depreciation and amortization	21,602	21,441	23,480
Deferred income taxes	(2,556)	1,871	(1,052)
(Gain) loss on sale of property, plant and equipment	(142)	(39)	(252)
Provision for uncollectible accounts	1,748	6,034	357
Stock-based compensation expense	7,461	6,317	6,302
Other	289	240	238
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:
Accounts receivable	(11,932)	4,152	6,831
Costs and estimated earnings in excess of billings on uncompleted contracts	13,567	(17,930)	(13,063)
Inventories	198	606	272
Other assets and liabilities	(7,641)	7,380	11,558
Accounts payable	(37,047)	14,698	12,957
Billings on uncompleted contracts in excess of costs and estimated earnings	5,212	(38,377)	(11,736)
Accrued expenses	(9,643)	1,657	(7,754)
Net cash provided by operating activities	(18,746)	33,587	26,240
Investing activities:
Acquisitions, net of cash acquired (Note 2)	(40,819)	(13,049)	(5,551)
Acquisition of property, plant and equipment	(11,908)	(13,939)	(15,773)
Proceeds from asset sales	1,308	422	750
Net cash used by investing activities	(51,419)	(26,566)	(20,574)
Financing activities:
Advances under senior revolving credit facility	126,933	10,213	11,165
Repayments of advances under senior revolving credit facility	(82,251)	(19,017)	(13,982)
Payment of debt amendment fees	(1,073)	0	0
Open market purchase of treasury shares	0	(10,461)	(5,000)
Issuances of common stock	253	638	493
Proceeds from issuance of common stock under employee stock purchase plan	305	335	298
Repurchase of common stock for payment of statutory taxes due on equity-based compensation	(2,290)	(4,588)	(2,528)
Capital contributions from noncontrolling interest	855	10,892	8,546
Repayment of acquired long-term debt	0	(1,858)	0
Net cash provided (used) by financing activities	42,732	(13,846)	(1,008)
Effect of exchange rate changes on cash	(418)	(758)	(2,534)
Net increase (decrease) in cash and cash equivalents	(27,851)	(7,583)	2,124
Cash and cash equivalents, beginning of period	71,656	79,239	77,115
Cash and cash equivalents, end of period	43,805	71,656	79,239
Other cash flow information:
Cash paid during the period for income taxes	11,968	9,365	6,960
Cash paid during the period for interest	1,788	881	1,281
Non-cash investing and financing activities:
Accrued working capital adjustment	1,687	0	0
Purchases of property, plant and equipment on account	483	193	439
Assumption of debt from acquisition	$ 0	$ 1,858	$ 0