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Investments (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Mar. 28, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale debt securities | $ 16,673 | $ 14,774
Marketable equity securities | 13,987 | 9,829
Non-marketable equity investments | 21,791 | 21,536
Investments | 52,451 | 46,139
Short-term investments | (16,966) | (14,582)
Investments | 35,485 | 31,557
Payments to acquire interest in joint venture | $ 15,000 | $ 15,000

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