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Financial Instruments (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Investments, All Other Investments [Abstract]    
Proceeds from sale of available-for-sale securities $ 156,094 $ 895
Gross realized gains on sale of available-for-sale securities 604 96
Gross realized losses on sale of available-for-sale securities (39) (47)
Net realized gains on sale of available-for-sale securities 565 49
Amortization of premiums on available-for-sale securities $ 711 $ 2,491