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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Net income (loss) $ 15,170 $ 3,203
Adjustments to reconcile net income to net cash provided (used) by operating activities, net of effects from acquisitions and disposals:    
Depreciation and amortization 13,623 15,546
Stock-based compensation expense 9,045 6,488
Deferred income tax 1,562 2,646
Gain on disposal of business (Note 3) (427) 0
Gain on sale of property, plant and equipment (810) (511)
Provision for uncollectible accounts (105) 12
Other 308 295
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions and disposals:    
Accounts receivable (71,436) 19,831
Costs and estimated earnings in excess of billings on uncompleted contracts 921 24,195
Inventories (3,492) (1,602)
Other assets and liabilities (14,750) (1,717)
Accounts payable 30,092 (37,697)
Billings on uncompleted contracts in excess of costs and estimated earnings 1,626 13,499
Accrued expenses 17,557 1,714
Net cash provided (used) by operating activities (1,116) 45,902
Investing activities:    
Acquisition of property, plant and equipment (13,721) (6,150)
Acquisition, net of cash acquired 0 (1,687)
Proceeds from disposal of business (Note 3) 3,885  
Proceeds from asset sales 1,059 857
Net cash used by investing activities (8,777) (6,980)
Financing activities:    
Advances under senior revolving credit facility 12,430 85,317
Repayments of advances under senior revolving credit facility (10,133) (120,862)
Payments of debt issuance costs 0 (364)
Open market purchase of treasury shares (5,190) 0
Issuances of common stock 128 0
Proceeds from issuance of common stock under employee stock purchase plan 235 224
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (1,685) (627)
Net cash used by financing activities (4,215) (36,312)
Effect of exchange rate changes on cash and cash equivalents (273) 470
Increase (decrease) in cash and cash equivalents (14,381) 3,080
Cash and cash equivalents, beginning of period 64,057 43,805
Cash and cash equivalents, end of period 49,676 46,885
Supplemental disclosure of cash flow information:    
Income taxes 742 1,231
Interest 1,340 2,065
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 1,100 $ 136