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Financial Instruments (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Mar. 30, 2019
Debt Securities, Available-for-sale [Line Items]          
Equity Securities, FV-NI, Unrealized Gain (Loss) $ 4,100 $ (73) $ 5,600 $ (6,300)  
Available-for-Sale Securities, Less Than 12 Months, Fair Value 105,178   105,178   $ 40,716
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (317)   (317)   (487)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 317,978   317,978   850,377
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (3,669)   (3,669)   (16,950)
Available-for-Sale Securities, Fair Value, Total 423,156   423,156   891,093
Available-for-Sale Securities, Gross Unrealized Losses, Total (3,986)   (3,986)   (17,437)
Non-financial institution securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-Sale Securities, Less Than 12 Months, Fair Value 3,705   3,705   4,767
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (10)   (10)   (4)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 4,184   4,184   51,044
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (50)   (50)   (558)
Available-for-Sale Securities, Fair Value, Total 7,889   7,889   55,811
Available-for-Sale Securities, Gross Unrealized Losses, Total (60)   (60)   (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 9,981   9,981   0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (2)   (2)   0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 13,127   13,127   13,542
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (21)   (21)   (139)
Available-for-Sale Securities, Fair Value, Total 23,108   23,108   13,542
Available-for-Sale Securities, Gross Unrealized Losses, Total (23)   (23)   (139)
Mortgage-Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-Sale Securities, Less Than 12 Months, Fair Value 76,433   76,433   34,595
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (277)   (277)   (480)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 236,370   236,370   597,394
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (3,141)   (3,141)   (14,155)
Available-for-Sale Securities, Fair Value, Total 312,803   312,803   631,989
Available-for-Sale Securities, Gross Unrealized Losses, Total (3,418)   (3,418)   (14,635)
Asset-backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-Sale Securities, Less Than 12 Months, Fair Value 3,180   3,180   0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (4)   (4)   0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 18,583   18,583   76,103
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (42)   (42)   (483)
Available-for-Sale Securities, Fair Value, Total 21,763   21,763   76,103
Available-for-Sale Securities, Gross Unrealized Losses, Total (46)   (46)   (483)
Commercial Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-Sale Securities, Less Than 12 Months, Fair Value 11,879   11,879   1,354
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (24)   (24)   (3)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 45,714   45,714   112,294
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (415)   (415)   (1,615)
Available-for-Sale Securities, Fair Value, Total 57,593   57,593   113,648
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (439)   $ (439)   $ (1,618)