Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ (1,898)	$ 36,877	$ 24,008
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions :
Depreciation and amortization	23,480	18,518	12,782
Stock-based compensation expense	6,302	5,688	3,831
Deferred income taxes	(1,052)	(3,852)	1,932
Allowance for uncollectible accounts	357	(159)	714
Impairment of Intangible Assets, Finite-lived	0	0	255
(Gain) loss on sale of property, plant and equipment	(252)	109	(1)
Other	238	208	163
Excess tax benefit of exercised stock options and vesting of deferred shares	1,802	1,730	37
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:
Accounts receivable	6,831	(31,395)	(32,408)
Costs and estimated earnings in excess of billings on uncompleted contracts	(13,063)	13,540	(5,211)
Inventories	272	(11)	(1,394)
Other assets	11,558	351	(2,157)
Accounts payable	12,957	29,234	19,256
Billings on uncompleted contracts in excess of costs and estimated earnings	(11,736)	3,142	32,555
Accrued expenses	(7,754)	6,468	2,796
Net cash provided by operating activities	24,438	76,988	57,084
Investing activities:
Acquisition of property, plant and equipment	(15,773)	(23,589)	(23,231)
Acquisition	(5,551)	(51,607)	(9,394)
Acquisition related adjustment	219
Proceeds from asset sales	750	553	186
Net cash used for investing activities	(20,574)	(74,643)	(32,439)
Financing activities:
Proceeds from Noncontrolling Interests	8,546	0	0
Exercise of stock options	493	1,175	875
Capital lease payments	0	0	(42)
Excess tax benefit of exercised stock options and vesting of deferred shares	1,802	1,730	37
Advances under credit agreement	11,165	87,826	25,565
Repayments of advances under credit agreement	(13,982)	(76,205)	(25,565)
Payment of debt amendment fees	0	(657)	0
Treasury shares sold to Employee Stock Purchase Plan	298	136	54
Open market purchase of treasury shares	(5,000)	0	0
Other treasury share purchases	(2,528)	(1,776)	(1,162)
Net cash used by financing activities	794	12,229	(238)
Effect of exchange rate changes on cash	(2,534)	(1,209)	(383)
Net increase (decrease) in cash and cash equivalents	2,124	13,365	24,024
Cash and cash equivalents, beginning of period	77,115	63,750	39,726
Cash and cash equivalents, end of period	79,239	77,115	63,750
Other cash flow information:
Income taxes	6,960	19,160	12,242
Interest	1,281	1,224	610
Non-cash investing:
Purchases of property, plant and equipment on account	$ 439	$ 527	$ 1,146