Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 16,863	$ 10,120
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	7,551	5,796
Deferred income tax	(2,102)	178
Gain on sale of property, plant and equipment	(57)	(51)
Allowance for uncollectible accounts	(36)	239
Stock-based compensation expense	2,515	1,812
Excess Tax Benefit from Share-based Compensation, Operating Activities	1,069	(56)
Other	100	97
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	11,665	(43,791)
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract	4,835	(2,411)
Inventories	(159)	(1,201)
Other assets	(123)	(991)
Accounts payable	32,712	10,879
Billings on uncompleted contracts in excess of costs and estimated earnings	(9,525)	27,313
Accrued expenses	(5,174)	(657)
Net cash provided (used) by operating activities	50,464	12,098
Investing activities:
Acquisition of property, plant and equipment	(11,965)	(12,041)
Net purchase price	51,398	9,394
Proceeds from asset sales	326	73
Net cash used by investing activities	(63,037)	(21,362)
Financing activities:
Issuances of common stock	602	106
Capital lease payments	0	(36)
Excess tax benefit of exercised stock options and vesting of deferred shares	6	29
Advances under credit agreement	33,318	18,475
Repayments of advances under credit agreement	(10,127)	(15,050)
Treasury shares purchased by Employee Stock Purchase Plan	38	22
Other treasury share purchases	(1,638)	(1,065)
Net cash provided (used) by financing activities	22,199	2,481
Effect of exchange rate changes on cash	(84)	266
Net decrease in cash and cash equivalents	9,542	(6,517)
Cash and cash equivalents, beginning of period	63,750	39,726
Cash and cash equivalents, end of period	73,292	33,209
Supplemental disclosure of cash flow information:
Income taxes	6,812	6,559
Interest	462	281
Non-cash investing and financing activities:
Purchases of property, plant and equipment on account	$ 1,079	$ 494