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Revenue Recognition (Narrative) (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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, performance obligation, description of timing			Payment terms to customers generally range from net 30 to 120 days from invoice, which are considered to be standard payment terms.
Unbilled receivables	$ 28,474		$ 28,474		$ 22,794	$ 14,167
Decrease to accumulated deficit	(734,837)		(734,837)		(740,736)	(746,359)
Advance payments and unearned revenue	18,507		18,507		12,700	19,300
Total revenues	54,037	$ 62,093	179,629	$ 179,998
Advance Payments and Unearned Revenue and Long-term Unearned Revenue	26,600		26,600
Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unbilled receivables	(15,943)		(15,943)		8,627
Decrease to accumulated deficit	(10,576)		(10,576)		5,623
Advance payments and unearned revenue	7,023		7,023		(6,600)
Total revenues	77		(12,585)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unbilled receivables	12,531		12,531			14,167
Decrease to accumulated deficit	(745,413)		(745,413)			(746,359)
Advance payments and unearned revenue	25,530		25,530			$ 19,300
Total revenues	54,114		167,044
Product sales
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	34,615	40,686	115,696	113,472
Product sales | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	304		(10,215)
Product sales | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	34,919		105,481
Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	19,422	$ 21,407	63,933	$ 66,526
Revenue recognized, previously deferred	1,700		7,100
Services | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	(227)		(2,370)
Services | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 19,195		$ 61,563
Transferred at Point in Time | Product sales | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unbilled receivables					10,500
Decrease to accumulated deficit					1,700
Transferred over Time | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to accumulated deficit					700
Transferred over Time | Product sales | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to accumulated deficit					700
Transferred over Time | Services | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unbilled receivables					4,700
Decrease to accumulated deficit					1,600
Transfer of Control | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to accumulated deficit					400
Advance payments and unearned revenue					(600)
Unbilled Revenues [Member] | Adjustments due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Decrease to accumulated deficit					$ 500

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