Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 24,008	$ 17,188	$ 18,982
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions :
Depreciation and amortization	12,782	11,485	11,067
Stock-based compensation expense	3,831	3,504	2,395
Deferred income taxes	1,932	83	3,743
Allowance for uncollectible accounts	714	24	447
Impairment of Intangible Assets, Finite-lived	255	0	0
(Gain) loss on sale of property, plant and equipment	(1)	(158)	113
Other	163	65	72
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:
Accounts receivable	(32,408)	(4,575)	(16,499)
Costs and estimated earnings in excess of billings on uncompleted contracts	(5,211)	(28,506)	890
Inventories	(1,394)	(233)	1,202
Other assets	(2,194)	(1,888)	2,028
Accounts payable	19,256	12,862	(9,326)
Billings on uncompleted contracts in excess of costs and estimated earnings	32,555	(5,192)	6,608
Accrued expenses	2,796	(1,718)	1,027
Net cash provided by operating activities	57,084	2,941	22,749
Investing activities:
Acquisition of property, plant and equipment	(23,231)	(13,534)	(10,416)
Acquisition	(9,394)	0	(3,800)
Acquisition related adjustment	0	241	0
Proceeds from asset sales	186	598	150
Net cash used for investing activities	(32,439)	(12,695)	(14,066)
Financing activities:
Exercise of stock options	875	167	166
Capital lease payments	(42)	(258)	(731)
Excess tax benefit of exercised stock options and vesting of deferred shares	37	0	50
Advances under credit agreement	25,565	9,105	0
Repayments of advances under credit agreement	(25,565)	(9,105)	0
Payment of debt amendment fees	0	(643)	(216)
Treasury shares sold to Employee Stock Purchase Plan	54	47	10
Open market purchase of treasury shares	0	(8,126)	0
Other treasury share purchases	(1,162)	(537)	(299)
Net cash used by financing activities	(238)	(9,350)	(1,020)
Effect of exchange rate changes on cash	(383)	(527)	795
Net increase (decrease) in cash and cash equivalents	24,024	(19,631)	8,458
Cash and cash equivalents, beginning of period	39,726	59,357	50,899
Cash and cash equivalents, end of period	63,750	39,726	59,357
Other cash flow information:
Income taxes	12,242	12,016	6,251
Interest	610	478	632
Non-cash investing:
Purchases of property, plant and equipment on account	$ 1,146	$ 457	$ 765