Summary of Significant Accounting Policies Other assets (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 28, 2019 |
Dec. 29, 2018 |
Dec. 30, 2017 |
|
Security Owned Not Readily Marketable [Line Items] | |||
Gain (Loss) on Sale of Equity Investments | $ 8,439 | $ 0 | $ 0 |
Equity Securities without Readily Determinable Fair Value, Amount | $ 21,000 | $ 15,100 |