Financial Instruments, Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Jun. 29, 2019
Debt Securities, Available-for-sale [Abstract]
Estimated Fair Value		$ 140,990
Debt Securities, Available-for-sale, Amortized Cost	$ 98,099	141,031
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	83	68
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6	109
Debt Securities, Available-for-sale	98,176
Certificates of deposit
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	0	1,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	0	1,000
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	98,099	140,031
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	83	68
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6	109
Debt Securities, Available-for-sale	$ 98,176	$ 139,990

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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