Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 17,953	$ 3,819
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	9,337	7,320
Stock-based compensation expense	4,621	3,632
Benefit for deferred income taxes	(4,186)	(2,606)
Non-cash interest expense	0	471
Other non-cash items	378	(51)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivable, and cost in excess of billings	(7,810)	10,111
Inventory	(11,149)	(104)
Prepaid income taxes	(657)	597
Prepaid expenses and other current assets	(718)	(1,553)
Other non-current assets	(595)	(86)
Accounts payable and accrued expenses	12,841	(7,377)
Deferred revenues and customer advances	(627)	(3,816)
Income taxes payable	(11,279)	(35)
Other non-current liabilities	(81)	(39)
Net cash provided by operating activities	8,028	10,283
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(6,000)	0
Purchases of property and equipment	(3,628)	(6,050)
Other investing activities	(374)	(111)
Net cash used in investing activities	(10,002)	(6,161)
Cash flows from financing activities:
Proceeds from employee stock plans	0	80
Payments for retirement of common stock	(13,548)	(6,128)
Payments of capital lease obligations	0	(2,500)
Net cash used in financing activities	(13,548)	(8,548)
Effect of exchange rate changes on cash and cash equivalents	(41)	49
Net decrease in cash and cash equivalents	(15,563)	(4,377)
Cash and cash equivalents at beginning of period	41,637	81,691
Cash and cash equivalents at end of period	26,074	77,314
Cash paid during the period for:
Interest	3	1,351
Income taxes	$ 7,851	$ 717