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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Sep. 26, 2020
Mar. 28, 2020
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 207,736 $ 76,724
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (140) (389)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 13,158 34,408
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (314) (663)
Available-for-Sale Securities, Fair Value, Total 220,894 111,132
Available-for-Sale Securities, Gross Unrealized Losses, Total (454) (1,052)
Non-financial institution securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 19,993  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses 0  
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0  
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0  
Available-for-Sale Securities, Fair Value, Total 19,993  
Available-for-Sale Securities, Gross Unrealized Losses, Total 0  
U.S. Government and Agency Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 149,947  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (4)  
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0  
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0  
Available-for-Sale Securities, Fair Value, Total 149,947  
Available-for-Sale Securities, Gross Unrealized Losses, Total (4)  
Debt Security, Government, Non-US [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 24,997 30,998
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1) (17)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value, Total 24,997 30,998
Available-for-Sale Securities, Gross Unrealized Losses, Total (1) (17)
Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 9,134 13,492
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (76) (88)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 12,474 31,819
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (181) (389)
Available-for-Sale Securities, Fair Value, Total 21,608 45,311
Available-for-Sale Securities, Gross Unrealized Losses, Total (257) (477)
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   1,641
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses   (2)
Available-for-Sale Securities, 12 Months or Greater, Fair Value   0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses   0
Available-for-Sale Securities, Fair Value, Total   1,641
Available-for-Sale Securities, Gross Unrealized Losses, Total   (2)
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 3,665 30,593
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (59) (282)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 684 2,589
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (133) (274)
Available-for-Sale Securities, Fair Value, Total 4,349 33,182
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (192) $ (556)