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Cash and Investments (Gross Unrealized Losses) (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 56,299	$ 17,377
Gross Unrealized Losses	(12)	(8)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	28,445	14,529
Gross Unrealized Losses	(7)	(3)
U.S. Treasury and government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Fair Value	21,989	2,848
Gross Unrealized Losses	(4)	$ (5)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value	5,865
Gross Unrealized Losses	$ (1)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

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-Name Accounting Standards Codification
-Topic 326
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-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455

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