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Revenue Recognition (Impacts on Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018	Jun. 30, 2018	Jun. 29, 2018
Income Statement Related Disclosures [Abstract]
Total revenues	$ 54,037	$ 62,093	$ 179,629	$ 179,998
Total cost of revenues	37,782	43,961	122,959	122,680
Selling and administrative expenses	13,408	14,745	41,405	42,571
Net income (loss)	4,339	(2,390)	5,899	2,396
ASSETS
Accounts receivable, net	45,622		45,622		$ 45,571	$ 43,068
Unbilled receivables	28,474		28,474		22,794	14,167
Inventories	10,309		10,309		9,774	21,290
Other current assets	4,664		4,664		6,482	6,006
Deferred income taxes	12,185		12,185		5,055	5,600
Other assets	12,098		12,098		9,996	9,816
Liabilities [Abstract]
Accrued expenses	22,234		22,234			25,864
Advance payments and unearned revenue	18,507		18,507		12,700	19,300
Unearned revenue	8,071		8,071		7,295	6,593
Reserve for uncertain tax positions	3,654		3,654			2,941
Equity [Abstract]
Accumulated deficit	(734,837)		(734,837)		(740,736)	(746,359)
Calculated under Revenue Guidance in Effect before Topic 606
Income Statement Related Disclosures [Abstract]
Total revenues	54,114		167,044
Total cost of revenues	37,762		115,681
Selling and administrative expenses	13,369		41,331
Net income (loss)	4,705		945
ASSETS
Accounts receivable, net	38,149		38,149			43,068
Unbilled receivables	12,531		12,531			14,167
Inventories	28,839		28,839			21,290
Other current assets	4,324		4,324			6,006
Deferred income taxes	12,730		12,730			5,600
Other assets	11,799		11,799			9,816
Liabilities [Abstract]
Accrued expenses	21,865		21,865
Advance payments and unearned revenue	25,530		25,530			19,300
Unearned revenue	7,050		7,050			6,593
Reserve for uncertain tax positions	3,617		3,617
Equity [Abstract]
Accumulated deficit	(745,413)		(745,413)			$ (746,359)
Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Income Statement Related Disclosures [Abstract]
Total revenues	77		(12,585)
Total cost of revenues	(20)		(7,278)
Selling and administrative expenses	(39)		(74)
Net income (loss)	366		(4,954)
ASSETS
Accounts receivable, net	(7,473)		(7,473)		2,503
Unbilled receivables	(15,943)		(15,943)		8,627
Inventories	18,530		18,530		(11,516)
Other current assets	(340)		(340)		476
Deferred income taxes	545		545		(545)
Other assets	(299)		(299)		180
Liabilities [Abstract]
Accrued expenses	(369)		(369)
Advance payments and unearned revenue	7,023		7,023		(6,600)
Unearned revenue	(1,021)		(1,021)		702
Reserve for uncertain tax positions	(37)		(37)
Equity [Abstract]
Accumulated deficit	(10,576)		(10,576)		$ 5,623
Product sales
Income Statement Related Disclosures [Abstract]
Total revenues	34,615	40,686	115,696	113,472
Total cost of revenues	23,712	28,704	76,670	76,151
Product sales | Calculated under Revenue Guidance in Effect before Topic 606
Income Statement Related Disclosures [Abstract]
Total revenues	34,919		105,481
Total cost of revenues	24,046		71,276
Product sales | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Income Statement Related Disclosures [Abstract]
Total revenues	304		(10,215)
Total cost of revenues	334		(5,394)
Services
Income Statement Related Disclosures [Abstract]
Total revenues	19,422	21,407	63,933	66,526
Total cost of revenues	14,070	$ 15,257	46,289	$ 46,529
Services | Calculated under Revenue Guidance in Effect before Topic 606
Income Statement Related Disclosures [Abstract]
Total revenues	19,195		61,563
Total cost of revenues	13,716		44,405
Services | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Income Statement Related Disclosures [Abstract]
Total revenues	(227)		(2,370)
Total cost of revenues	$ (354)		$ (1,884)

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