Financial Instruments, Short-term Investments (Details) - USD ($)	3 Months Ended	12 Months Ended
Sep. 23, 2017	Jun. 27, 2015	Jun. 24, 2017
Available-for-sale Securities [Abstract]
Amortized Cost	$ 1,198,159,000		$ 499,952,000
Gross Unrealized Gain	1,000		0
Gross Unrealized Loss	(1,333,000)		(1,234,000)
Estimated Fair Value	1,196,827,000		498,718,000
Agency Securities
Available-for-sale Securities [Abstract]
Amortized Cost	6,973,000		0
Gross Unrealized Gain	1,000		0
Gross Unrealized Loss	0		0
Estimated Fair Value	6,974,000		0
Certificates of deposit
Available-for-sale Securities [Abstract]
Amortized Cost	47,549,000		0
Gross Unrealized Gain	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	47,549,000		0
Commercial paper
Available-for-sale Securities [Abstract]
Amortized Cost	105,971,000		0
Gross Unrealized Gain	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	105,971,000		0
Corporate debt securities
Available-for-sale Securities [Abstract]
Amortized Cost	381,292,000		0
Gross Unrealized Gain	0		0
Gross Unrealized Loss	(177,000)		0
Estimated Fair Value	381,115,000		0
U.S. Treasury securities
Available-for-sale Securities [Abstract]
Amortized Cost	656,374,000		499,952,000
Gross Unrealized Gain	0		0
Gross Unrealized Loss	(1,156,000)		(1,234,000)
Estimated Fair Value	655,218,000		$ 498,718,000
Short-Term Investment [Member]
Schedule of Available-for-sale Securities [Line Items]
Impairment charges	$ 0	$ 0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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