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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Jul. 01, 2017
Apr. 01, 2017
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 1,249,003 $ 1,310,037
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (11,404) (15,101)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 221,694 258,680
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (15,009) (17,571)
Available-for-Sale Securities, Fair Value, Total 1,470,697 1,568,717
Available-for-Sale Securities, Gross Unrealized Losses, Total (26,413) (32,672)
Non-financial institution securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 73,844 68,850
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (334) (492)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 1,018 1,022
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (1) (4)
Available-for-Sale Securities, Fair Value, Total 74,862 69,872
Available-for-Sale Securities, Gross Unrealized Losses, Total (335) (496)
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 53,539 64,895
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (178) (223)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 4,596 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (4) 0
Available-for-Sale Securities, Fair Value, Total 58,135 64,895
Available-for-Sale Securities, Gross Unrealized Losses, Total (182) (223)
Foreign Government Debt Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   64,857
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses   (51)
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   64,857
Available-for-Sale Securities, Gross Unrealized Losses, Total   (51)
Mortgage-Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 809,678 811,058
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (9,098) (11,872)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 95,890 139,931
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (1,451) (2,885)
Available-for-Sale Securities, Fair Value, Total 905,568 950,989
Available-for-Sale Securities, Gross Unrealized Losses, Total (10,549) (14,757)
Asset-backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 125,635 119,845
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (418) (651)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 5,858 4,689
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (23) (35)
Available-for-Sale Securities, Fair Value, Total 131,493 124,534
Available-for-Sale Securities, Gross Unrealized Losses, Total (441) (686)
Debt Mutual Fund [Member]    
Fair values and gross unrealized losses of the investments    
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 89,897 88,676
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (11,453) (12,674)
Available-for-Sale Securities, Fair Value, Total 89,897 88,676
Available-for-Sale Securities, Gross Unrealized Losses, Total (11,453) (12,674)
Bank Loans [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 35,556 15,139
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (160) (106)
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 35,556 15,139
Available-for-Sale Securities, Gross Unrealized Losses, Total (160) (106)
Commercial Mortgage Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 150,751 165,393
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1,216) (1,706)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 24,435 24,362
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (2,077) (1,973)
Available-for-Sale Securities, Fair Value, Total 175,186 189,755
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (3,293) $ (3,679)