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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended
Aug. 09, 2018
Mar. 29, 2020
Mar. 31, 2019
Dec. 29, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on investments   $ 47,900,000 $ 33,000,000.0  
Equity method investments   230,264,000   $ 226,602,000
Government bonds   6,200,000    
Other-than-temporary impairment loss   $ 0    
Enphase Shares        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Shares issuable to the Company at closing of agreement 7,500,000      
Investment shares sold (in shares)   1,000,000,000,000    
Proceeds from sale of equity investment   $ 43,700,000    
Total equity method investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity method investments   $ 27,200,000   $ 26,500,000