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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Jun. 27, 2020
Mar. 28, 2020
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 562,535 $ 76,724
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (281) (389)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 17,278 34,408
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (368) (663)
Available-for-Sale Securities, Fair Value, Total 579,813 111,132
Available-for-Sale Securities, Gross Unrealized Losses, Total (649) (1,052)
Non-financial institution securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 44,978  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1)  
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 44,978  
Available-for-Sale Securities, Gross Unrealized Losses, Total (1)  
U.S. Government and Agency Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 416,542  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (31)  
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 416,542  
Available-for-Sale Securities, Gross Unrealized Losses, Total (31)  
Debt Security, Government, Non-US [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 74,942 30,998
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (36) (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 74,942 30,998
Available-for-Sale Securities, Gross Unrealized Losses, Total (36) (17)
Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 7,216 13,492
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (104) (88)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 15,299 31,819
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (215) (389)
Available-for-Sale Securities, Fair Value, Total 22,515 45,311
Available-for-Sale Securities, Gross Unrealized Losses, Total (319) (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 18,857 30,593
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (109) (282)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 1,979 2,589
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (153) (274)
Available-for-Sale Securities, Fair Value, Total 20,836 33,182
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (262) $ (556)