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Cash and Investments - Narrative (Details)	3 Months Ended		9 Months Ended
	Mar. 29, 2019 USD ($) investment	Mar. 30, 2018 USD ($)	Sep. 28, 2018 USD ($)	Dec. 28, 2018 USD ($) investment
Investments, Debt and Equity Securities [Abstract]
Gain (loss) on sales of investments available-for-sale	$ 0	$ 0
Number of investments in an unrealized loss position | investment	69			199
Other-than-temporary impairment charges on available-for-sale securities	$ 0	$ 0
Beneficial ownership interest by BlackRock (more than)	10.00%
Fair value of cash and investments managed by BlackRock	$ 356,000,000			$ 298,500,000
Fair value of cash and investments managed by BlackRock in the BlackRock Liquidity Money Market Fund	$ 800,000			$ 3,000,000
Fees for advisory services paid to BlackRock			$ 100,000

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Amount of realized gain (loss) on 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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Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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-Publisher FASB
-Name Accounting Standards Codification
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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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