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Cash and Investments - Narrative (Details)	3 Months Ended		6 Months Ended
	Jul. 03, 2020 USD ($) investment	Jun. 28, 2019 USD ($)	Jul. 03, 2020 USD ($) investment	Jun. 28, 2019 USD ($)	Jan. 03, 2020 USD ($) investment
Investments, Debt and Equity Securities [Abstract]
Interest receivable	$ 5,300,000		$ 5,300,000		$ 6,200,000
Gain (loss) on sales of investments available-for-sale	$ 0	$ 0	$ 0	$ 0
Number of investments in an unrealized loss position | investment	17		17		9
Allowance for credit losses	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Number of investments in debt securities 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

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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