Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Statement of Cash Flows [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired	$ (8,250)	$ 0
Payments of Debt Restructuring Costs	0	(573)
Operating activities:
Net income	10,120	10,540
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	5,796	5,738
Deferred income tax	178	(28)
Gain on sale of property, plant and equipment	(51)	(43)
Allowance for uncollectible accounts	239	29
Stock-based compensation expense	1,812	1,735
Other	41	(28)
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	(43,819)	(12,241)
Costs and estimated earnings in excess of billings on uncompleted contracts	2,411	(16,474)
Inventories	(1,201)	(332)
Other assets	(991)	(1,561)
Accounts payable	9,763	12,565
Billings on uncompleted contracts in excess of costs and estimated earnings	27,313	(3,669)
Accrued expenses	(657)	(2,059)
Net cash provided (used) by operating activities	10,954	(5,828)
Investing activities:
Acquisition of property, plant and equipment	(12,041)	(6,759)
Proceeds from asset sales	73	177
Net cash used by investing activities	(20,218)	(6,582)
Financing activities:
Issuances of common stock	106	80
Capital lease payments	(36)	(182)
Excess tax benefit of exercised stock options and vesting of deferred shares	29	0
Advances under credit agreement	18,475	0
Repayments of advances under credit agreement	(15,050)	0
Treasury shares purchased by Employee Stock Purchase Plan	22	27
Open market purchase of treasury shares	0	(8,126)
Other treasury share purchases	(1,065)	(439)
Net cash provided (used) by financing activities	2,481	(9,213)
Effect of exchange rate changes on cash	266	(292)
Net decrease in cash and cash equivalents	(6,517)	(21,915)
Cash and cash equivalents, beginning of period	39,726	59,357
Cash and cash equivalents, end of period	33,209	37,442
Supplemental disclosure of cash flow information:
Income taxes	6,559	3,640
Interest	281	279
Non-cash investing and financing activities:
Purchases of property, plant and equipment on account	$ 494	$ 637