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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Dec. 28, 2019
Mar. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 105,454 $ 40,716
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (316) (487)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 240,764 850,377
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (2,848) (16,950)
Available-for-Sale Securities, Fair Value, Total 346,218 891,093
Available-for-Sale Securities, Gross Unrealized Losses, Total (3,164) (17,437)
Non-financial institution securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 5,195 4,767
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (2) (4)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 3,550 51,044
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (25) (558)
Available-for-Sale Securities, Fair Value, Total 8,745 55,811
Available-for-Sale Securities, Gross Unrealized Losses, Total (27) (562)
U.S. Government and Agency Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 0 0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses 0 0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 1,997 13,542
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (3) (139)
Available-for-Sale Securities, Fair Value, Total 1,997 13,542
Available-for-Sale Securities, Gross Unrealized Losses, Total (3) (139)
Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 63,878 34,595
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (254) (480)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 199,346 597,394
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (2,429) (14,155)
Available-for-Sale Securities, Fair Value, Total 263,224 631,989
Available-for-Sale Securities, Gross Unrealized Losses, Total (2,683) (14,635)
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 8,277 0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (4) 0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 10,182 76,103
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (18) (483)
Available-for-Sale Securities, Fair Value, Total 18,459 76,103
Available-for-Sale Securities, Gross Unrealized Losses, Total (22) (483)
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 28,104 1,354
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (56) (3)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 25,689 112,294
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (373) (1,615)
Available-for-Sale Securities, Fair Value, Total 53,793 113,648
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (429) $ (1,618)