Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 27,086	$ 9,023
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	18,939	15,176
Stock-based compensation expense	9,448	7,725
Benefit for deferred income taxes	(4,833)	(1,002)
Non-cash interest expense	0	935
Other non-cash items	847	(341)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivable, and cost in excess of billings	(9,181)	1,189
Inventory	(22,455)	(3,882)
Prepaid income taxes	1,414	(1,623)
Prepaid expenses and other current assets	(1,970)	376
Other non-current assets	(2,507)	(97)
Accounts payable and accrued expenses	11,597	(1,903)
Deferred revenues and customer advances	1,976	(1,310)
Income taxes payable	(11,284)	305
Other non-current liabilities	(2,270)	(50)
Net cash provided by operating activities	16,807	24,521
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(5,798)	(38,764)
Purchases of property and equipment	(7,592)	(13,753)
Other investing activities	(375)	(111)
Net cash used in investing activities	(13,765)	(52,628)
Cash flows from financing activities:
Proceeds from employee stock plans	2,049	2,733
Payments for retirement of common stock	(14,909)	(7,560)
Payments under credit facilities	(15,000)	(2,500)
Borrowings under credit facilities	15,000	0
Net cash used in financing activities	(12,860)	(7,327)
Effect of exchange rate changes on cash and cash equivalents	216	(72)
Net decrease in cash and cash equivalents	(9,602)	(35,506)
Cash and cash equivalents at beginning of period	41,637	81,691
Cash and cash equivalents at end of period	32,035	46,185
Cash paid during the period for:
Interest	111	2,785
Income taxes	9,928	2,731
Supplemental disclosures—non-cash activities:
Non-cash investing activity	$ 0	$ 1,816