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Summary of Significant Accounting Policies - (Marketable Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Investment [Line Items]
Marketable securities	$ 2,272	$ 3,649
Marketable securities, gain (loss)	1,800	2,700	$ (1,000)
Investments
Investment [Line Items]
Marketable securities, gain (loss)	(100)	200
Aggregated Cost
Investment [Line Items]
Marketable securities	2,200	3,500
Estimate of Fair Value Measurement
Investment [Line Items]
Marketable securities	$ 2,300	$ 3,600

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

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