Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 30,782	$ 16,071
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	30,320	23,139
Stock-based compensation expense	13,045	11,440
Benefit for deferred income taxes	(5,482)	(5,618)
Non-cash interest expense	0	1,362
Other non-cash items	1,243	(628)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivable, and cost in excess of billings	(19,827)	2,011
Inventory	(24,931)	(6,615)
Prepaid income taxes	(1,060)	1,913
Prepaid expenses and other current assets	944	(1,134)
Other non-current assets	277	(116)
Accounts payable and accrued expenses	2,943	(566)
Deferred revenues and customer advances	2,758	(777)
Income taxes payable	(11,286)	4,443
Other non-current liabilities	(2,046)	4,485
Net cash provided by operating activities	17,680	49,410
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(185,396)	(36,911)
Purchases of property and equipment	(11,067)	(26,789)
Other investing activities	(375)	(486)
Net cash used in investing activities	(196,838)	(64,186)
Cash flows from financing activities:
Proceeds from employee stock plans	2,049	2,903
Payments for retirement of common stock	(15,118)	(7,682)
Payments under credit facilities	(15,000)	(7,500)
Borrowings under credit facilities	210,000	0
Proceeds from equity offering, net	0	215,732
Net cash provided by financing activities	181,931	203,453
Effect of exchange rate changes on cash and cash equivalents	(193)	(130)
Net increase in cash and cash equivalents	2,580	188,547
Cash and cash equivalents at beginning of period	41,637	81,691
Cash and cash equivalents at end of period	44,217	270,238
Cash paid during the period for:
Interest	1,101	4,251
Income taxes	$ 9,928	$ 2,731