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Financial Instruments (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Investments, All Other Investments [Abstract]    
Proceeds from sale of available-for-sale securities $ 37,657 $ 156,094
Gross realized gains on sale of available-for-sale securities 360 604
Gross realized losses on sale of available-for-sale securities 0 (39)
Net realized gains on sale of available-for-sale securities 360 565
Amortization of premiums (discounts) on available-for-sale securities $ (91) $ 711