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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income $ 28,655 $ 16,641
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 12,945 9,211
Deferred income tax (4,501) 208
Gain on sale of property, plant and equipment (39) (9)
Allowance for uncollectible accounts (81) 662
Stock-based compensation expense 3,905 2,830
Other 150 97
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable (58,955) (23,194)
Costs and estimated earnings in excess of billings on uncompleted contracts (10,901) (1,997)
Inventories (109) (1,311)
Other assets 5,738 (2,942)
Accounts payable 38,734 10,153
Billings on uncompleted contracts in excess of costs and estimated earnings (4,684) 19,500
Accrued expenses 9,298 7,492
Net cash provided by operating activities 20,155 37,341
Investing activities:    
Acquisition of property, plant and equipment (17,834) (16,640)
Acquisition, net of cash acquired (51,398) (9,394)
Proceeds from asset sales 327 171
Net cash used by investing activities (68,905) (25,863)
Financing activities:    
Issuances of common stock 1,076 558
Capital lease payments 0 (39)
Excess tax benefit of exercised stock options and vesting of deferred shares 1,597 42
Advances under credit agreement 68,970 25,565
Repayments of advances under credit agreement (23,867) (25,565)
Payment of debt amendment fees (507) 0
Treasury shares purchased by Employee Stock Purchase Plan 76 35
Other treasury share purchases (1,678) (1,082)
Net cash provided (used) by financing activities 45,667 (486)
Effect of exchange rate changes on cash (909) (43)
Net increase (decrease) in cash and cash equivalents (3,992) 10,949
Cash and cash equivalents, beginning of period 63,750 39,726
Cash and cash equivalents, end of period 59,758 50,675
Supplemental disclosure of cash flow information:    
Income taxes 11,445 7,404
Interest 579 457
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 965 $ 748