Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 46,775,000	$ 40,883,000	$ 24,875,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	46,392,000	42,277,000	32,269,000
Stock-based compensation expense	19,422,000	17,314,000	15,341,000
Deferred income taxes	(1,557,000)	(5,464,000)	(7,841,000)
Non-cash interest expense	0	0	1,810,000
Other non-cash items	3,779,000	2,103,000	(626,000)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivable, and cost in excess of billings	(28,096,000)	(22,751,000)	(14,054,000)
Inventory	(17,101,000)	(16,230,000)	(9,318,000)
Prepaid income taxes	3,843,000	(2,327,000)	1,978,000
Prepaid expenses and other current assets	(1,075,000)	(361,000)	(1,270,000)
Other non-current assets	101,000	296,000	372,000
Accounts payable and accrued expenses	17,949,000	(5,267,000)	3,520,000
Deferred revenues and customer advances	(1,531,000)	6,035,000	(1,621,000)
Income taxes payable	3,152,000	(11,187,000)	9,622,000
Other non-current liabilities	44,000	(2,000,000)	4,089,000
Net cash provided by operating activities	97,517,000	43,321,000	59,146,000
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(127,083,000)	(185,396,000)	(77,757,000)
Purchases of property and equipment	(26,691,000)	(15,106,000)	(32,844,000)
Other investing activities	0	(375,000)	(486,000)
Net cash used in investing activities	(153,774,000)	(200,877,000)	(111,087,000)
Cash flows from financing activities:
Proceeds from Issuance of Common Stock	454,343,000	0	215,725,000
Proceeds from employee stock plans	3,661,000	3,445,000	4,970,000
Stock Repurchased and Retired During Period, Value	(7,968,000)	(15,508,000)	(8,766,000)
Payments of term debt	(324,500,000)	(15,000,000)	(200,000,000)
Borrowings under credit facilities	129,500,000	210,000,000	0
Payments of Financing Costs	1,851,000	0	591,000
Net cash provided by financing activities	247,765,000	182,937,000	11,338,000
Effect of exchange rate changes on cash and cash equivalents	(97,000)	(497,000)	549,000
Net increase (decrease) in cash and cash equivalents	191,411,000	24,884,000	(40,054,000)
Cash and cash equivalents at beginning of year	66,521,000	41,637,000	81,691,000
Cash and cash equivalents at end of year	257,932,000	66,521,000	41,637,000
Cash paid during the period for:
Interest	10,368,000	1,607,000	5,758,000
Income taxes	7,351,000	17,004,000	2,834,000
Proceeds from Issuance or Sale of Equity	770,000	0	0
Payments for Derivative Instrument, Financing Activities	(5,420,000)	0	0
Derivative, Gain (Loss) on Derivative, Net	$ 5,420,000	$ 0	$ 0