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Investments (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Mar. 28, 2020
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale debt securities $ 12,676 $ 14,774
Marketable equity securities 12,791 9,829
Non-marketable equity investments 21,400 21,536
Investments 46,867 46,139
Short-term investments (16,589) (14,582)
Investments 30,278 31,557
Payments to acquire interest in joint venture $ 15,000 $ 15,000