Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 16,071	$ 12,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	23,139	9,878
Stock-based compensation expense	11,440	7,244
Benefit for deferred income taxes	(5,618)	(1,257)
Impairment of goodwill and long-lived assets	0	231
Non-cash interest expense	1,362	0
Other non-cash items	(628)	(614)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivable, and cost in excess of billings	2,011	(14,850)
Inventory	(6,615)	(2,351)
Prepaid income taxes	1,913	1,836
Prepaid expenses and other current assets	(1,134)	4,024
Other non-current assets	(116)	(1,008)
Accounts payable and accrued expenses	(566)	7,991
Deferred revenues and customer advances	(777)	(2,230)
Income taxes payable	4,443	2,107
Other non-current liabilities	4,485	(62)
Net cash provided by operating activities	49,410	23,192
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(36,911)	(9,756)
Purchases of property and equipment	(26,789)	(4,908)
Increase in other investing activities	(486)	(567)
Net cash used in investing activities	(64,186)	(15,231)
Cash flows from financing activities:
Proceeds from employee stock plans	2,903	2,804
Payments for retirement of common stock	(7,682)	(4,211)
Proceeds from equity offering, net	215,732	0
Payments of capital lease obligations	(7,500)	0
Net cash provided by (used in) financing activities	203,453	(1,407)
Effect of exchange rate changes on cash and cash equivalents	(130)	105
Net increase in cash and cash equivalents	188,547	6,659
Cash and cash equivalents at beginning of period	81,691	77,586
Cash and cash equivalents at end of period	270,238	84,245
Cash paid during the period for:
Interest	4,251	10
Income taxes	$ 2,731	$ 1,717