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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Mar. 28, 2020
Mar. 30, 2019
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 76,724 $ 40,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (389) (487)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 34,408 850,377
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (663) (16,950)
Available-for-Sale Securities, Fair Value, Total 111,132 891,093
Available-for-Sale Securities, Gross Unrealized Losses, Total (1,052) (17,437)
Non-financial institution securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   4,767
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (4)
Available-for-Sale Securities, 12 Months or Greater, Fair Value   51,044
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (558)
Available-for-Sale Securities, Fair Value, Total   55,811
Available-for-Sale Securities, Gross Unrealized Losses, Total   (562)
U.S. Government and Agency Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-Sale Securities, 12 Months or Greater, Fair Value   13,542
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (139)
Available-for-Sale Securities, Fair Value, Total   13,542
Available-for-Sale Securities, Gross Unrealized Losses, Total   (139)
Mortgage-Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 13,492 34,595
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (88) (480)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 31,819 597,394
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (389) (14,155)
Available-for-Sale Securities, Fair Value, Total 45,311 631,989
Available-for-Sale Securities, Gross Unrealized Losses, Total (477) (14,635)
Asset-backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 1,641 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) 0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0 76,103
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (483)
Available-for-Sale Securities, Fair Value, Total 1,641 76,103
Available-for-Sale Securities, Gross Unrealized Losses, Total (2) (483)
Debt Security, Government, Non-US [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 30,998  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (17)  
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Available-for-Sale Securities, Fair Value, Total 30,998  
Available-for-Sale Securities, Gross Unrealized Losses, Total (17)  
Commercial Mortgage Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 30,593 1,354
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (282) (3)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 2,589 112,294
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (274) (1,615)
Available-for-Sale Securities, Fair Value, Total 33,182 113,648
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (556) $ (1,618)