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Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2020	Sep. 26, 2020	Sep. 26, 2020	Dec. 28, 2019
Equity and cost method investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount		$ 15,300	$ 15,300	$ 21,000
Equity Securities, FV-NI, Restricted		52,100	52,100
Equity Securities, FV-NI, Unrealized Gain		$ 4,900	$ 5,500
Gain (Loss) on Sale of Equity Investments	$ 38,600

X

- Definition

Equity and cost method investments [Abstract]

+ References

No definition available.

+ Details

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- Definition

Amount of restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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- Definition

Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

No definition available.

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