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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Operating activities:      
Net income $ 36,877 $ 24,008 $ 17,188
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions :      
Depreciation and amortization 18,518 12,782 11,485
Stock-based compensation expense 5,688 3,831 3,504
Deferred income taxes (3,852) 1,932 83
Allowance for uncollectible accounts (159) 714 24
Impairment of Intangible Assets, Finite-lived 0 255 0
(Gain) loss on sale of property, plant and equipment 109 (1) (158)
Other 208 163 65
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:      
Accounts receivable (31,395) (32,408) (4,575)
Costs and estimated earnings in excess of billings on uncompleted contracts 13,540 (5,211) (28,506)
Inventories (11) (1,394) (233)
Other assets (1,379) (2,194) (1,888)
Accounts payable 29,234 19,256 12,862
Billings on uncompleted contracts in excess of costs and estimated earnings 3,142 32,555 (5,192)
Accrued expenses 6,468 2,796 (1,718)
Net cash provided by operating activities 76,988 57,084 2,941
Investing activities:      
Acquisition of property, plant and equipment (23,589) (23,231) (13,534)
Acquisition (51,607) (9,394) 0
Acquisition related adjustment 0 0 241
Proceeds from asset sales 553 186 598
Net cash used for investing activities (74,643) (32,439) (12,695)
Financing activities:      
Exercise of stock options 1,175 875 167
Capital lease payments 0 (42) (258)
Excess tax benefit of exercised stock options and vesting of deferred shares 1,730 37 0
Advances under credit agreement 87,826 25,565 9,105
Repayments of advances under credit agreement (76,205) (25,565) (9,105)
Payment of debt amendment fees (657) 0 (643)
Treasury shares sold to Employee Stock Purchase Plan 136 54 47
Open market purchase of treasury shares 0 0 (8,126)
Other treasury share purchases (1,776) (1,162) (537)
Net cash used by financing activities 12,229 (238) (9,350)
Effect of exchange rate changes on cash (1,209) (383) (527)
Net increase (decrease) in cash and cash equivalents 13,365 24,024 (19,631)
Cash and cash equivalents, beginning of period 63,750 39,726 59,357
Cash and cash equivalents, end of period 77,115 63,750 39,726
Other cash flow information:      
Income taxes 19,160 12,242 12,016
Interest 1,224 610 478
Non-cash investing:      
Purchases of property, plant and equipment on account $ 527 $ 1,146 $ 457